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HP Pavillion - No startup


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#1 mikey11

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Posted 07 February 2016 - 01:49 PM

HP Pavillion 500 desktop computer

 

push power button, processor fan moves ever so slightly, maybe 1/16th rotation and stops, and absolutely nothing else happens,

 

tested power supply unit, it is fine, i even replaced the power supply unit with a known working one, same problem,

 

i unplugged the 4 pin power connector from the motherboard, with this connector unplugged the computer will turn on, fans spinning etc etc, but i get nothing on the monitor,

 

motherboard im assuming?


Edited by mikey11, 07 February 2016 - 01:49 PM.


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#2 Niweg

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Posted 08 February 2016 - 05:30 PM

 It sounds like the motherboard.  Do you get any beeps?  It doesn't sound like you do.  If the board is more than a couple of years old, it could possibly be the dreaded "bad caps" (bad capacitors) problem.  You might look to see if you spot any that are swollen or leaking.

 

 Good luck,


Make regular full system backups or you'll be sorry sooner or later.


#3 mikey11

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Posted 09 February 2016 - 04:26 PM

no beeps or sounds whatsoever,

 

i did inspect all the caps and none were visably bulged or leaking,

 

but i still think it must be the motherboard,



#4 dc3

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Posted 16 February 2016 - 11:50 AM

When you press the power button this shorts the two header pins on the motherboard which in turn shorts the green wire and a black wire in the twenty four pin PSU connector attached to the motherboard.  This turns on the PSU.  If the motherboard was dead this would not work.

 

The four pin power connector for the CPU provides power exclusively for the PCU.  Because the fans spin up and the LEDs light up with this connector unplugged I would suspect that the CPU has a problem.  These tend to either work or not work, nothing in between.

 

Have you had any recent overheating issues with the CPU?


Family and loved ones will always be a priority in my daily life.  You never know when one will leave you.

 

 

 

 





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