Hello all. I've never encountered any problem like this that wouldnt be solved with some quick searches on the internet.
I'll get straight to the point:
I had a XFX Geforce 9800gtx, which i changed to a Gainward Geforce gtx275 the other day. Everything seemed fine, i installed the drivers from disc without problem. Then I did some testing to see if everything was fine (Crysis, etc). No problems detected.
So I figured I'd go online to see if there had been released more recent drivers for my card. But to my surprise I noticed that I had 'Limited or no connection' (don't know how to translate it more accurately as I'm running a norwegian version of Vista).
I proceeded doing all the usual troubleshooting, like unplugging the modem and setting it back in, flushing dns, ipconfig, etc, and when I tried changing the ethernet cable i noticed an orange light in the back of my ethernet adapter, so i figured that it might have been damaged by static or something (which i REALLY doubt).
Anyway, after trying 10 different cables, 20-30 modem reboots with no luck. I figured I'd check out the BIOS. This part really puzzled me; when i tried pressing delete to enter setup all i got was a black screen. Figured it was a fluke, so i tried resetting with the powerbutton, but the same problem reoccured.
tl;dr: my computer runs as usual, meaning windows boots like it should.
Problem: Orange light in ethernet port, can't enter windows. Problem first occured after changing graphics adapter.