I had very similar situation...same reboot pattern...I think the same with keyboard (mine would light up, but become seemingly inoperable during the installation of windows xp)
As for my problems, I solved them by copying the drivers for my sata drive onto a floppy (of course you'll need to do that with another computer or put your old one back together). At the point where windows aks if you want to install raid or third party drivers, select that and load from floppy. (P.S. I tried to use a hard drive with windows already installed and it did not like it at all...no workie) After this Windows recognized my hard drive after loading the drivers and I was off to the races.
Note: My system ran fine for a couple weeks and then suddenly I had tons of problems...random reboots, lock-ups, cmos checksum errors, bad memory tests....you name it. I removed devices one at a time, tested psu, checked all drivers, ran mem tests, cleared cmos...blah, blah, blah. From the previous posts I learned, as should have you, to save bios changes before exiting. ("save changes", then you can "exit wtihout saving changes" ) Believe me I thought I was hosed for a couple days. SAVE FIRST - THEN EXIT.
Secondarily, I found a download on AMD's site that related to conflicts between AGP and AMD cpu's. I ran that and it made an change to my registry that is supposed to prevent these conflicts. (Don't know whether that was a part of the solved problem, but for me at the least it has not hurt anything.)
Thanks to all who posted. You were a great help. I Saved much time and potentially money.