Sounds like a very simple problem right? Well, it took me an hour to fix and the solution is so simple but it's never the first thing that comes into mind.
So yesterday I came home and Joey was asking my why Youtube upload keep failing, and upon inspection, the network connection was down. Here are the steps that was taken in sequence.
![](http://img.zemanta.com/pixy.gif?x-id=d9a03d6d-1260-889b-b652-f1d244b7c741)
So yesterday I came home and Joey was asking my why Youtube upload keep failing, and upon inspection, the network connection was down. Here are the steps that was taken in sequence.
- Check LAN connection on router - connection was intact
- Check LAN connection on PC - connection was intact
- Unplug LAN cable from PC and plug into my MacBook - MacBook detected LAN working - therefore PC LAN port fried?
- Plug cable as peer from PC to MacBook - no problem, APIPA assigned and can ping each other (after turning off firewall at Windows 7)
- Both LAN ports on PC and MacBooks seems OK. Router issue? Tried all 4 ports from Linksys WRT54G to PC - no connection - no lights at all and Windows says that Media Disconnected
- Tried all 4 ports from Linksys to MacBook - all ports working!
- Took out my 8 port 10BaseT hub and connect to Linksys - no problem - lights on
- Plug my MacBook into 10BaseT hub - obtained DHCP and able to browse Internet
- Plug PC into 10BaseT hub - lights we on but no DHCP IP
- Restarted DHCP Client service - no help
- Disabled NIC and reenable - no help
- Uninstall NIC driver and reinstall - no help
- Rebooted PC - numerous time - no help
- Changed the NIC card auto-negotiation setting to both 100Mbps and 10Mbps - no help
- YANK the power cord from the PSU, wait for a few seconds to make sure all power is discharged - and turn PC back on. Everything works fine now.
- The house had a power trip that evening,
- It was never an issue before coz I had a UPS
- The UPS died last year
- Somehow the NIC card thinks that the Linksys caused the power trip and therefore actively rejects it - until a complete power cycle (from the mains power, that is) is performed
![](http://img.zemanta.com/pixy.gif?x-id=d9a03d6d-1260-889b-b652-f1d244b7c741)
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