What are some signs of a failing HD? I think my HD is failin or my mobo just sucks. Every once in a while my comp will just crash, restart then say "Reboot and select proper boot device or insert boot media in selected boot device and press a key" and the first screen durin startup and BIOS dont read my HD. My comp recently crashed when i was doin a disk cleanup. Sometimes it will read my HD too. Is this a mobo problem or HD problem?