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Re: my compaq keeps restarting itself every 20 seconds
If it keeps trying to restart it sounds like a problem a lot of HP and Compaq models are having. If you can get on the Compaq or HP website, they list all the models they are offering a one time fix at no charge, even if out of warranty.( My wife just had the same problem with her HP}
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The computer may be in hibernate or standby. Try pressing the space bar, and then wait a moment. See if anything happens. If nothing happens, press the power button for one second and wait a moment and see if anything happens. If nothing occurs, you may need to force a restart.
To force a restart, hold in the power button for approximately 15-20 seconds, this should force the computer to turn off all the way. If holding the power button doesn't do the trick - you can unplug the computer from the wall and take out the laptop battery as a last resort.
Once you are sure the computer is off all the way, press the power button and see if anything at all shows on the screen. If you are not able to see any information on the screen, it is possible that the Laptops screen has gone bad. If you have an external monitor you can try to plug into it and see if anything shows. If nothing shows, it is possible the video card/motherboard is gone bad.
To fully diagnose a bad motherboard or video card - you would need to take it to a qualified computer technician.
I think this might be a common problem caused by windows sleep/hibernate not working (MS never actually got it to work well)
Try holding down the power button for 30 seconds. Wait 10 seconds, then start up again.
If you get the same problem, try tapping the space bar repeatedly...
Otherwise your going to need to boot off a windows disk, and do a re-install/repair.