Solve : my old HP tower shuts down before it gets to windows screen..?

1.	Solve : my old HP tower shuts down before it gets to windows screen..?
Answer» I turn pc on , the HP screen shows up ,then next a black screen with grey WRITTING asking me to indicate which of the two o/s SYSTEMS I choose .( both are xp professional) then I click on either one and back up comes the hp screen and then the black screen with grey writting again. It just keeps repeating this over and over again. I tried clicking on F8 like is says I can on the bottom of the HP screen, and trying the various options , but nothing helps.. The only clue I have is that I often shut the pc off and hook it to my flatscreen TV to veiw MOVIES. Thats when it started acting up.. I had just swiched over to the TV and turned the pc on and noticed it doing this on the TV.. I FIGURED it was something wrong with the tv settings so went back to my monitor and found it doing the same thing.. Any help will be apprciated . Thanks , Neilfixed it by playing around , a bit RISKY but it was that or reinstall wqindows and loose it all.

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