I have an HP Compaq dc7600 computer that I used Sunday and it worked fine. When I was through I turned off the computer. Today I tried to use the computer and it won't boot.
When you turn the computer on a blue screen with HP appears. At the bottom it has F9, F10, F12.
After a moment the screen goes blank and a small grey box appears momentarily and then the computer goes back to the blue screen. This occurs over and over and the computer will not boot.
What could cause this? Thanks.

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