HDD "was" ticking, now my 2 other HDD's don't show up in OS, or bios

Hi, i have 3 hdd’s, a 74gb raptor that started ticking all of a sudden, that gave me a few software errors, and now my op’ system is really slow booting, but it works and isn’t ticking anymore.

I also have 2 other hard drives, a 300gb maxtor, and a 500gb seagate, now neither of them show up in my computer, or even in the bios. I’ve run chkdsk, and then seagate seatools, which on the long test told me I have 4 errors on the Raptor (boot drive).

Any help on what to do to get the other 2 to show up again please???
And what to do to fix the other one???

Thanks.

Asus P5QL Pro mobo
Sapphire HD4850 (dual slot)
Q6600
2 X 1GB OCZ Reaper, 800Mhz
74GB Raptor HDD
300GB Maxtor HDD
500GB Seagate HDD
Ultra X3 800w
Asus DRW-1814BLT Drive
Media Centre Edition 2005, SP3

can you disconnect the raptor, are other drvs now working

what kind of errors ?
Seatools is really for Seagate drives visit WD & download the latest LifeGuard tools & reanalyze drive with LifeGuard tools from WD, here i think,
will the OS install onto either other drive if you disconnect the raptor ?