I have a weird problem with my 1TB Caviar Black HDD.

My PC has a 120 GB OCZ Agility 3 SSD with the 1TB Caviar Black HDD. When the PC came in, the SSD would disappear when I was idle, for example I'd go to bed, wake up, turn on the monitor & be greeted with "NTLDR is missing". I would restart & the SSD wouldn't even show in the BIOS, I had to cold boot for it to show up. I have since disabled all power options & this no longer happens since the SSD no longer goes in hibernate mode but my HDD seems to be doing the same thing that the SSD used to be doing.

I did a restart, played around a bit & less than 2 hours later, the HDD just disappeared.. I have to restart everytime for the HDD to come back on but it disappears every 2 hours or so.

Does the HDD have power options of it's own that makes it go in hibernate mode? Could there be an issue with the SATA cable?