Posted 10 June 2008 - 06:49 PM
A new hard drive typically comes with nothing installed on it. So you'd have to use your recovery disks to reinstall the operating system on this Compaq computer. If this is the case, then the "Operating System not found" message makes sense.
If the operating system is already installed, then there's some difficulty with the system recognizing the disk. The first thing to check would be the connections and the jumper on the drive (to ensure it's set the same as the old drive). If the computer can't recognize the MBR (Master Boot Record), then it can't locate the Boot Sector for the hard drive and won't be able to load Windows.
There's many steps to look at for the stuff in the second paragraph, so please let us know which situation we're dealing with and we can move on from there.
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