Hello all, I've built a few machines in my time, and swapped oodles of hardware, but I think I've outdone myself this time. I had a machine (the Machine In Question) that was running as my server (Cyrus-IMAP, Sendmail, Apache, Gallery, Instiki) just fine... until in anticipation of getting a CPU upgrade, I tweaked some BIOS timing settings, and corrupted the hard disk. Badly. I loaded the "Performace" defaults back, but the damage to the disk was done. I also cooked the new CPU and destroyed the heat sink. I bought a new heat sink and re-installed the old CPU, and the temperature monitors seemed very happy again. Well last night I finally copied off the /etc directory, put it back in the MIQ and attempted to install FC4 cleanly (new partitions). It all seemed to go well until formatting, at which point it locked up hard. Since it's a Seagate drive, I tried to run Seagate's diagnostic software, and that locked up too. Perhaps of interest is that Hitachi's Drive Fitness Test quick and full tests passed AOK. I tried the install once again with the same result. Then I put in a Maxtor drive and got the SAME RESULT. Both drives appear to run fine in an external enclosure on another machine, but I have not done extensive tests. Now I'm beginning to think that the IDE controller, or maybe the entire motherboard is suspect, and that I shouldn't trust my incoming e-mail to such a flaky machine... so I should just replace the motherboard. If it matters, the motherboard is an ABIT KT7-RAID, the CPU is a 900MHz Athlon, it has 512MB PC133 RAM. The hard drives are Seagate and Maxtor 120GB ATA drives. The fan on the bridge chip failed about a year ago, and I recently replaced it. Since the motherboard has a RAID controller on it, I can disable the normal IDE controller, but that might not be trustworthy either. Your experienced opinions and guesses as to what's going on, and suggestions for next steps are welcome. And if you have a KT7 or KT7A with or without RAID you might sell, let me know.