This is a problem in progress, so I'll come back here and update when I get my replacement parts back. I'm hoping this was a one-time bug, not an indication of conflicts with my hardware.
I got the SL-K8AN2E-GR mobo, along with an A64-3200, 1 gig of matched 512MB Corsair Value Select, a Rosewill Radeon 9600, and two Highpoint SATA-IDE converters. I hooked all of this up with two existing ATA-133 Maxtors I had lying around. (All of this came from NewEgg.) I'm not overclocking this rig at all.
Once assembled, everything POSTed correctly. But things went downhill from there. The first problem was with the video: after I loaded the drivers, the card would intermittently flash to a black screen, similar to a resolution change. It did this regardless of the version of the Catalyst drivers I got hold of (older, newer, etc.). The only way to make it stop was to either not load the drivers (default to the Windows VGA driver), or turn off all hardware acceleration in the driver.
As I was messing with that, I started having problems with my hard drives on the primary SATA ports (not RAID, just two drives) using the Highpoint converters. The system would no longer boot from the drives. I eventually tried installing XP on a different drive connected to the standard ATA connector, and it worked OK. But if I then moved that drive to the SATA port on the SATA converter, it would partially boot but then spontaneously re-boot.
I've RMA'd the Radeon, the motherboard and both SATA converters. Rather than try to diagnose precisely what was going on, I'd prefer to get new hardware and try again. My greatest fear is that there's some fundamental incompatability with the CPU/memory/motherboard that's triggering all of this behavior. I'd rather not eat the 15% restocking fee to get refunds on all of this.
If anyone has any experience/insights on these problems, I'd appreciate hearing them. Thanks.