Hello,i switched my pc on a few days ago and i got a message saying there was an error in loading the operating system and also that the hard disc drive was not installed.the pc had been working fine the previous night.im using microsoft windows 2000 professional.its a dell optiplex gx150 bios revision a09.
this may be due to dust in teh computer.
remove the computer from the mains supply and open it.
the give a thorough clean-up, check the hard disk cable, remove it and plug it again.
mount everything rght and swtch it on.