SATA HDD problem

About a month ago I was playing a game and my computer froze. I am using windows XP and it had never crashed on me before. so I restarted and it loaded up normally and it crashed again later. So I went into CMOS and checked to see if they were being recognized and they weren't. so I restarted and went back into CMOS to check again and they were there. The two weeks later the same thing happened. This time they are not being detected at all. I have flashed the bios several times. Since then I have been using the Official PS2 HDD as my hard drive. I have had the drives for about a year now I will give you a rundown of the specs:

CPU: P4 3.0GHz
RAM: Corsair Value Select 512MB of PC4200
HDD: Western Digital Caviar SE WD1200JD 120GB 7200 RPM Serial ATA150 x2
PSU: Powmax 580Watt
Motherboard: BIOSTAR N4SIE-A7

I know it is not the PSU because they are getting ample power and I tested the burg connectors to make sure they voltages were correct. I have not tested the HDDs on another computer that has SATA on it. Any help is greatly appreciated.