I'll make my story short. I upgraded my bios to the newest version for my motherboard (see specifications above) - 1.0A. Then I unplugged my PATA storage disk and reinstalled WinXP on my SATA RAID array. Then I rebooted and plugged my PATA disk back in. Now Windows won't boot - giving me an error about not being able to read from the selected boot disk. I have ofcourse check a million times that my RAID is healthy, set as bootable, set as 1. boot priority, etc.
If I unplug my PATA disk, everything is working perfectly. I suspect there's a problem with the motherboard running SATA RAID and PATA at the same time, but since there's no menu in the bios for selecting 'Combined Mode SATA/PATA' I take that the bios update made it automatically.
I have checked every single options in my BIOS for an options that could help me, but no luck. I've also tried putting the PATA on primary/secondary cable as master/slave. Nothing helps.
I have looked at other threads and seen 1 thread that had almost similar problem, but the solution there didn't help me either, so I really hope someone is gonna use some time to help me out, I'd deeply appreciate it.