{"id":65,"date":"2025-10-10T05:12:38","date_gmt":"2025-10-10T05:12:38","guid":{"rendered":"https:\/\/askyourpc.com\/?post_type=docs&#038;p=65"},"modified":"2025-10-10T05:12:38","modified_gmt":"2025-10-10T05:12:38","password":"","slug":"network-port-ethernet-not-working-fix-lan-jack-driver-issues","status":"publish","type":"docs","link":"https:\/\/www.askyourpc.com\/es\/docs\/network-port-ethernet-not-working-fix-lan-jack-driver-issues\/","title":{"rendered":"Network Port (Ethernet) Not Working \u2014 Fix LAN Jack &#038; Driver Issues"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Overview<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If your laptop or desktop\u2019s wired internet connection suddenly stops working\u2014or the Ethernet port doesn\u2019t light up\u2014the issue is usually <strong>driver-related, cable-related, or power-related<\/strong>, not a failed motherboard.<br>This guide walks through the exact steps to verify the LAN adapter, restore link lights, and re-enable reliable wired connectivity on both Windows and macOS.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What you\u2019ll learn<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>How to confirm that the Ethernet adapter is active and detected<\/li>\n\n\n\n<li>How to reinstall or roll back network drivers<\/li>\n\n\n\n<li>How to test cables, jacks, and link lights<\/li>\n\n\n\n<li>How to reset network stack and firmware settings<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Estimated time:<\/strong> 15\u201330 minutes<br><strong>Skill level:<\/strong> Intermediate<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Terms and Definitions<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Term<\/th><th>Meaning<\/th><\/tr><\/thead><tbody><tr><td><strong>LAN (Local Area Network)<\/strong><\/td><td>Wired connection between your device and router\/switch<\/td><\/tr><tr><td><strong>RJ-45 jack<\/strong><\/td><td>Standard Ethernet port on most laptops and desktops<\/td><\/tr><tr><td><strong>Link lights<\/strong><\/td><td>Small LEDs near the Ethernet jack indicating physical connectivity<\/td><\/tr><tr><td><strong>DHCP<\/strong><\/td><td>Service that automatically assigns IP addresses on your network<\/td><\/tr><tr><td><strong>MAC address<\/strong><\/td><td>Unique hardware ID for your network adapter<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Steps<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1 \u2014 Check Physical Link Lights and Cable<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Look for <strong>green or amber LEDs<\/strong> on the Ethernet jack.\n<ul class=\"wp-block-list\">\n<li><strong>Steady light:<\/strong> physical link detected<\/li>\n\n\n\n<li><strong>Blinking light:<\/strong> data activity<\/li>\n\n\n\n<li><strong>No light:<\/strong> cable or port issue<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Try a <strong>different cable<\/strong> or <strong>different router port<\/strong>.<\/li>\n\n\n\n<li>If you\u2019re using a USB-to-Ethernet adapter, move it to another USB port and observe if lights appear.<\/li>\n\n\n\n<li>If possible, test the same cable with another computer.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">If link lights remain off, continue to driver and power checks.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2 \u2014 Confirm Adapter Detection<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Windows PowerShell<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-NetAdapter | Where-Object {$_.Name -like \"*Ethernet*\"} | Select-Object Name, Status, LinkSpeed, MacAddress\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">If the adapter is <strong>Disabled<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Enable-NetAdapter -Name \"Ethernet\"\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>macOS Terminal<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>networksetup -listallhardwareports\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Look for \u201cHardware Port: Ethernet\u201d and note the <strong>Device<\/strong> (e.g., en0).<br>Check interface status:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ifconfig en0\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">If it doesn\u2019t show \u201cstatus: active,\u201d the cable isn\u2019t linked or the driver isn\u2019t active.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3 \u2014 Restart or Reinstall Network Drivers<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Windows<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Open <strong>Device Manager \u2192 Network adapters<\/strong>.<\/li>\n\n\n\n<li>Right-click your Ethernet adapter (Realtek, Intel, Broadcom, etc.) \u2192 <strong>Disable device<\/strong>, then <strong>Enable device<\/strong>.<\/li>\n\n\n\n<li>If still inactive, choose <strong>Uninstall device<\/strong>, then <strong>Scan for hardware changes<\/strong>.<\/li>\n\n\n\n<li>Optionally, download the latest driver from your laptop manufacturer or NIC vendor.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>PowerShell<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-NetAdapter | Disable-NetAdapter -Confirm:$false\nGet-NetAdapter | Enable-NetAdapter -Confirm:$false\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>macOS<\/strong><br>Ethernet drivers are built-in. If the port isn\u2019t active, delete and re-add the interface:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ifconfig en0 down\nsudo ifconfig en0 up\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4 \u2014 Verify IP Configuration<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Windows<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ipconfig \/all\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IPv4 address is valid (not <code>169.254.x.x<\/code>)<\/li>\n\n\n\n<li>Default gateway is listed<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">If you see a <code>169.254<\/code> address, renew DHCP:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ipconfig \/release\nipconfig \/renew\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>macOS<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ifconfig en0\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">If no IP is assigned, renew:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ipconfig set en0 DHCP\n<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5 \u2014 Disable Power Saving Features<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Windows<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Open <strong>Device Manager \u2192 Network adapters \u2192 [Your Ethernet Adapter] \u2192 Properties<\/strong>.<\/li>\n\n\n\n<li>Go to the <strong>Power Management<\/strong> tab.<\/li>\n\n\n\n<li>Uncheck:<br>\u201cAllow the computer to turn off this device to save power.\u201d<\/li>\n\n\n\n<li>Click <strong>OK<\/strong>.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>macOS<\/strong><br>Disable energy-saving network options:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo pmset -a womp 0\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">(<code>womp<\/code> = \u201cWake on Magic Packet\u201d) \u2014 sometimes triggers network instability after sleep.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 6 \u2014 Check Router and Switch Ports<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Try another Ethernet port on your router or switch.<\/li>\n\n\n\n<li>Power-cycle your router: unplug for 30 seconds, plug back in.<\/li>\n\n\n\n<li>If using a managed switch, ensure the port isn\u2019t administratively disabled.<\/li>\n\n\n\n<li>Connect directly from laptop \u2192 modem (bypass router) to isolate the problem.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 7 \u2014 Reset Network Stack and DNS<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Windows<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>netsh winsock reset\nnetsh int ip reset\nipconfig \/flushdns\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Restart afterward to apply.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>macOS<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo dscacheutil -flushcache\nsudo killall -HUP mDNSResponder\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Flushes DNS and resets cache.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 8 \u2014 Reset Firmware Controllers<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Windows (EC Reset)<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Shut down your laptop.<\/li>\n\n\n\n<li>Disconnect charger and battery (if removable).<\/li>\n\n\n\n<li>Hold Power for 15 seconds.<\/li>\n\n\n\n<li>Reconnect and start up.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>macOS (SMC Reset)<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Shut down.<\/li>\n\n\n\n<li>Hold <strong>Shift + Control + Option + Power<\/strong> for 10 seconds.<\/li>\n\n\n\n<li>Release all keys and start the Mac.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">These resets reinitialize hardware controllers that handle I\/O power\u2014including Ethernet.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 9 \u2014 Check Event Logs<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Windows PowerShell<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-WinEvent -LogName System | Where-Object {$_.Message -like \"*Ethernet*\"} | Select TimeCreated, Message -First 15\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Look for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>\u201cLink Down\u201d<\/em> \/ <em>\u201cMedia Disconnected\u201d<\/em><\/li>\n\n\n\n<li><em>\u201cDriver failed to start\u201d<\/em><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>macOS<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>log show --predicate 'eventMessage CONTAINS \"Ethernet\"' --last 2h\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Confirms whether macOS is detecting link attempts or driver restarts.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Verification<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Check<\/th><th>Command<\/th><th>Expected Result<\/th><\/tr><\/thead><tbody><tr><td>Physical link<\/td><td>Visual<\/td><td>Link LEDs on and blinking<\/td><\/tr><tr><td>Adapter status<\/td><td><code>Get-NetAdapter<\/code> \/ <code>ifconfig en0<\/code><\/td><td>Status = Up or Active<\/td><\/tr><tr><td>IP address<\/td><td><code>ipconfig<\/code> \/ <code>ifconfig<\/code><\/td><td>Valid DHCP address<\/td><\/tr><tr><td>Connection<\/td><td><code>ping 8.8.8.8<\/code><\/td><td>Replies received<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A non-functional Ethernet port is often a matter of <strong>drivers, power management, or cable failure<\/strong>, not a dead motherboard.<br>By checking physical link lights, reinstalling drivers, disabling power saving, and resetting your network stack, you can restore stable wired connectivity quickly.<br>If link lights stay dark across multiple cables and systems, the LAN controller or port itself may have failed and require professional repair.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview If your laptop or desktop\u2019s wired internet connection suddenly stops working\u2014or the Ethernet port doesn\u2019t light up\u2014the issue is usually driver-related, cable-related, or power-related, not a failed motherboard.This guide walks through the exact steps to verify the LAN adapter, restore link lights, and re-enable reliable wired connectivity on both Windows and macOS. What you\u2019ll [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[12],"doc_tag":[],"class_list":["post-65","docs","type-docs","status-publish","hentry","doc_category-hardware-fixes"],"blocksy_meta":[],"year_month":"2026-08","word_count":738,"total_views":"11","reactions":{"happy":"0","normal":"0","sad":"0"},"author_info":{"name":"user","author_nicename":"user","author_url":"https:\/\/www.askyourpc.com\/es\/author\/user\/"},"doc_category_info":[{"term_name":"Hardware Fixes","term_url":"https:\/\/www.askyourpc.com\/es\/docs-category\/hardware-fixes\/"}],"doc_tag_info":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Network Port (Ethernet) Not Working \u2014 Fix LAN Jack &amp; Driver Issues - Ask Your PC<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/askyourpc.com\/docs\/network-port-ethernet-not-working-fix-lan-jack-driver-issues\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Network Port (Ethernet) Not Working \u2014 Fix LAN Jack &amp; Driver Issues - Ask Your PC\" \/>\n<meta property=\"og:description\" content=\"Overview If your laptop or desktop\u2019s wired internet connection suddenly stops working\u2014or the Ethernet port doesn\u2019t light up\u2014the issue is usually driver-related, cable-related, or power-related, not a failed motherboard.This guide walks through the exact steps to verify the LAN adapter, restore link lights, and re-enable reliable wired connectivity on both Windows and macOS. 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