I'm in a hurry so to save time here's a cut/paste from another forum, both from me changing from socket 478 to Conroe:
Problem
I just got this mb 2 days ago, and the install went flawlessly. I booted up repaired my XP installation, then updated Windows. I benched my system with good results, played around a little bit, then shut it down for the night. After work I turned the computer on, and after post my video went black and Windows wouldn't load. Thinking my OS went bad?!?! I tried to do another repair installation. After booting to the XP disk and selecting install by repairing current OS the computer did the normal first reboot to install. The Windows load bars came up, but after that it just loaded a black screen with a mouse cursor.
I've tried several things to correct this:
Standard pci gfx card
reset cmos
turn off jmicron controller
load an earlier bios
reload latest bios
Several combinations of the above
My system specs are:
Intel E6600
OCZ GameXtreme 700w psu
EVGA 7900gs
2gb Crucial Ballistix DDR2-800
Lite-on DVD drive ide
NEC DVD drive ide
160gb Hitachi hd (system) sata
320gb Seagate hd(backup) sata
Any help you could provide would be greatly appreciated. At this point I'm thinking the mb is bad, but I'd really don't want to rma this thing. For the little time it worked, it worked great.
Edit: I also tried booting to a Ubuntu live cd. It gave me an Xgraphics(not sure what it said exactly, I'm not very familiar with Linux) error, and a very long error log that I don't know how to read. I got the Ubuntu console, but no gui.
Resolution
Thanks for the replies guys. You were absolutely right about the repair install. I went against my own advice to save some time and it ended up screwing me. It worked great the first day, but wouldn't start the next. I thought that I should still be able to do a repair and at least have it boot up, but obviously that's not the case.
I found that it probably wasn't the mb when I packed it up to RMA it, and reassembled my old computer. I went to repair my old comp and had the same problem. That narrowed the possibilities down a great extent lol. I ended up doing a new install using the unused portion of my backup drive and it's now working great. I should have backed up and done a fresh format and install in the first place but I was being lazy.
Well, all's well now, and thanks again for the help :^)