I think it's a P4PE problem. I moved to Asus and a P4PE after some Abit problems and I'd have to say I'm very dissapointed.
From day one I had 3 hdds a 120 GB SATA WD, and my old pair of IBM DTLA 30 GB drives, as well as a CDRW and a DVD drive. I cannot get the mobo to recognise all three hdds at once, period.
If I run one of the DTLA's off the ATA100 connector on the SATA/RAID controller, one of two things happens. If I turn off IDE as a bootup sequence choice (booting off the RAID/SATA controller) then I can see the 120 GB drive and also the DTLA on the RAID/SATA controller, but not the other IDE drive. It just doesn't detect it. If I turn off IDE as a boot sequence option, then I cant see the DTLA on the RAID/SATA controller, but can see the one on the IDE controller.
So I gave up on trying to install a hdd on the ATA100 port for the SATA controllers, and installed both DTLAs as primary devices on the IDE controllers. Then when I boot, the primary master is detected fine, but the secondary master looks like gibberish in the BIOS. Uh Oh, sounds like a bad drive. But if I disconnect the primary master from the data cable and reboot, there's the secondary master, working fine.
I don't think I have a power problem. With all three hdd connected, the Bios reports my voltages as:
Vcore: 1.55v
+3.3: 3.18v
+5: 5.05v
+12: 11.9v
OK not perfect, but not an explanation for what I am seeing. What I am seeing is a piece of crap Mobo that can't handle being anywhere near full on its IDE, ATA and SATA channels. I've emailed Asus, but they just don't respond. Believe me, it will be my last Asus purchase. They used to have such a good rep for solid mobos, what happened?
I think your problem is the same as mine, and the mobo is to blame.