Switched HDs to go back to win7 but still the same
If I understand correctly you have two different physical drives, with a different Operating System on each and both are exhibiting identical symptoms when you attempt to boot the computer from either.
That might suggest some faulty hardware.
You might start by inspecting the system physically, look for blown / leaking capacitors on the mainboard, remove and reseat all components, interface cables and PSU connections.
Yank all the memory modules and try with a single memory stick. You may have to swap sticks and slots as well for testing until you find one that works in a slot that works.
You may have a faulty drive controller, so.......
You may want to grab a copy of a Linux Distro Live CD and see if it will boot and run your system.
http://www.linuxmint.com/edition.php?id=191
You can use ImgBurn to burn the ISO to a DVD or Rufus to burn it to a USB ThumbDrive.