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compaq presario f761us black screen & repeated boot

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Hi Folks,

I was using my laptop and the screen became all fuzzy with horizontal/vertical lines (just like a tv going out of tune) and I decided to turn it off (pressed power button).   After turning it back on, there was the black screen and every 2-3 seconds rebooting by itself repeatedly.  I can see the charger LED, the disk and power LED, the LED for the DVD drive and the fan coming on  for a brief second, but black screen only after that (and reboot).  I have tried hard reset and reseating of the RAM, but it is the same.  If I press any key, then the lights stay on and it does not reboot. 

 

I appreciate the help, and will be glad to furnish any info about the situation.

 

Sam


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