Maxtor Diamond Max 22 HDD not detected in bios

Hi

I have a problem with my sata maxtor hdd which happens to be my primary drive.

Was working fine no problem, turned pc off to go bed. Woke up to use it and the hdd is not detected in the bios at all.

I did not update anything or change any settings the previous day it was working. The 2nd sata drive is detected fine.

I can hear the drive power up and spin etc but theres no unusual sounds coming from it.

I have tried swapping cables around with ones that I know work and tried the maxtor hdd in another pc but no luck.

Any advise would be helpful

Specs are

Asus p5ql/epu mobo
OCZ Stealth 600w psu
Intel quad core q660 2.4
2gb geil ram
gigabyte gts250 1gb