I have a HP 6475z. The system froze last night. I rebooted the system; it looked like a normal reboot but then the screen went black and the error message stated it could not find the operating system.
not sure if this has anything to do with it but......For months, I have noticed that my fan was going out but just did not have the time to fix it. (My computer is on a majority of the time and the fan was not spinning when I rebooted).
This is urgent for work ....especially over the weekend (I am on call)