Yet you see the beginning of the Windows splash screen? Or did you mean that you never make it past the bios post screen? If that is the case, the drive or another component on the notebook could well be dead, which would explain its issue when attached as a secondary drive. Can you boot the notebook off the USB when the drive is detached? Will the notebook boot off an optical drive with any kind of disk, like free memtest86+ burned to a CD ( http://www.memtest.org/
), which might be worth running anyway to check the other components.