Drive 1 not found, Strange Boot Error

Hi everybody,

I'm experiencing a strange boot error with my dimension 5000 at the moment.

I got my dimension with one 400gb sata harddrive (drive0), everything worked fine.
Later I added a 250gb sata harddrive, I made the 250gb drive my boot harddrive (drive0), and I changed the 400gb sata harddrive to drive1.

Now I get the following errormessage with a nice beep each time I start my system
(but not when I restart the system):

Drive 1 not found: Serial ATA, SATA-2
Strike the F1 key to continue, F2 to run the setup utility.

When I skip this message with F1, I get into my windows XP sp2, and both harddrives are recognized properly, and I have absolutely no problems with drive1 in windows.

So my question is how I can fix this annoying error, or at least disable the error-message, or anything else, so that I don't need to strike this annoying F1 each time I boot because of nothing.

THX a lot,

Greetings
EJ2005,

PS: here is what I've already tried:
- flashed the bios to the newest version (A02)
- loaded bios defaults
- converted the 400gb drive from logical (one partition) to primary and again to logical.
- checked all cables and power-connectors (tested them with drive0)
- ran the harddrive diagnostics (drive0 is recognized immediately, drive1 1min later)
- reinstalled windows
- cleared cmos
- changed sata operation mode from normal to combination and back to normal
- checked s.m.a.r.t diagnostics, everything fine.
possible problem (s.m.a.r.t says its normal):
(power-on time count=250 (250gb disk) and =667 (400gb disk)), but the 400gb worked fine in the beginning.