@dude
Yeah, This is a brand new blu-ray drive, and the DVD drive I had before had the same issues, yet worked on other machines fine.
I've had just one of the two memory sticks running and have had the same problems.
My dibs are on either the PSU or Motherboard; that the DVD drive is either not getting enough power, (but I've tried connecting the SATA power used with the HDD and same issue occurs), or the motherboards SATA controller is screwed.
What has really stressed me out now is my TV tuner has just bailed. I'm getting the error in device manager "The device cannot start (code 10)". It was working last night, and now it's botched.
It'd be good to reinstall Windows 7 entirely, but It's going to take another 12 hours and I can't even be sure it'll work as it should.