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No mouse,no keyboard, and no monitor?

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\015 I have been having this problem with my computer lately, sometimes the screen will go all crazy like a checkerboard of colors and frezze like that. so ill have to shut evreything down and reboot. then othertimes like now it wont come back on. the tower will come on, i can hear the fans blowing and all the lights are on, but i have no mouse, keyboard or monitor power..? the screen is just black. i cant do anything. in the past ive left it off for awhile and its came back on. but this time its not coming back on. b btw the computer is a desktop hp pavillion a1730n w/ windows vista home premium 32bit. also its only a little over a year old. it was purchased 4/16/07. thanks\015

Answers :

Back up everything important you have like pictures,songs,documents .
\015\012then go for a restore
\015\012you might have got restore discs along with the computer use them and take the system back to day one
\015\012you will loose everything you put on the system but you will have to back up data first.
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