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What would cause a computer to turn on by itself?


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#1 Sega Dude

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Posted 24 June 2014 - 05:18 PM

I have an older Compaq Presario 6016US desktop computer that turns on by itself from a completely powered down state. I've seen it happen at least twice. I'll be no where near it and it will just turn on like the power button was pressed. I leave it unplugged when not in use because it does this. What would cause it to turn itself on from a completely powered down state?



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#2 zingo156

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Posted 25 June 2014 - 08:21 AM

Most likely this is a physicall power button issue. They can wear out and cause this exact issue. The other thing it may be is a power supply related issue or mainboard problem. My guess is the power button. Unfortunately in most cases the power buttons are proprietary or use proprietary connections on Compaqs so replacing the button might be tricky.

 

You could open the case and look for blown or bulging capacitors on the mainboard examples here: https://www.google.com/search?q=blown+or+bulging+capacitors+motherboard&source=lnms&tbm=isch&sa=X&ei=p8yqU4r2K460yATtg4HgDg&ved=0CAcQ_AUoAg&biw=1272&bih=766


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#3 Netghost56

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Posted 25 June 2014 - 09:56 AM

Could also be a faulty PSU, one that is sending out power when it shouldn't. I've dealt with this in older systems.

Edited by Netghost56, 25 June 2014 - 09:56 AM.


#4 Kilroy

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Posted 26 June 2014 - 10:16 AM

Could also be Wake on LAN or a BIOS start up.  The other options however are more likely.






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