Can't connect to the Internet hardwired

I have windows 7 64 pro and I am having internet problems.

I am able to connect to the network (which has 2 other computers on it running Windows 7) but not to the internet.

I am hardwired from my router (linksys WRT54G). Sometimes it is able to connect and sometimes it is not (mostly not).

I have 2 other computers (one wireless, one hardwired) that are connected to the internet on the linksys WRT54G.

I've tried 2 motherboards (thought I might have bad Lan on 1st mb) and I am getting the same results.

Any ideas what the problem is, and how to resolve it?

Swap out the network cable with a known working cable, try a different router port, and make sure the network adapter is working properly in Device Mgr.

I updated bios on the new motherboard - tried it on the old mb and it didn't solve it. Then I reinstalled windows 7. Installed newest drivers and finally got it to work. I had tried all that on previous motherboard in addition to the steps above and couldn't get it to work. Thanks for your suggestions.

Well - internet is out again. Did Windows Update first time from Fresh install - restarted and still had internet. Did Windows Update a second time - restarted and still had internet. Did Windows Update a 3rd time - restarted and no internet. Tried to system restore back to 2nd update - no internet.

It's either Windows update or printer that must be causing an error... any ideas?

MSI H67MA-E35 MB
Intel I3 2101 Sandybridge
G.skill Ripjaws DDR31333 4gbx2
Seagate 7200 250gb hdd
Rosewill 650 ps

Finally figured it out. Bonjour was adding 0.0.0.0 as default gateway and causing problem with network. Disabled Bonjour and it was fixed.

Glad you were able to fix the problem.
Thanks for posting back with the solution.