Question about HP Pavilion a6720f PC Desktop

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I have a HP 6720 desktop. When I turn it on the power light comes on and the fans on the cpu and the tower fan both come on and run for just a second then shut down. The power light stays on. No signal to the monitor or keyboard lights don't light up. I have replaced the Power Supply, removed the ram 1 at a time, and tried a different video card. Nothing has worked. Any help would be appreciated.

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  • Master
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Psu or motherboard fault and use reginout

Posted on Sep 01, 2010

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Posted on Jan 02, 2017

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I put new power supply and button to turn and wot turn on


Do the fans come on. ? on the power supply. Do you know if power comes out of the power point. Can you plug in a lamp into the power point and get power out of the power point and light up a power point. Do you have a VOLT METER you could test the
DC leads coming out of the power supply .
There may be a power lead that powers the CPU fan have you connected this to the cpu cooling fan connection point on the motherboard .

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Why my desktop did not turn on?


U need technician, tell him to check with the other power supply then if he dont have another power supply then connect the Green and Blank point on the cable coming from the SMPS, if SMPS fan is powering on then issue is with ur motherboard and if not then issue is with ur power supply that is SMPS

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PC runs great until you power completely off. The it will take several tries of power on attempts. It will not start with the CPU fan coming on high speed. Must keep trying until low speed is heard. I...


Sounds like a problem with the power supply based on what you've written. Could be motherboard too, but Power Supply is usually the culprit.

I'd swap it out to test ;)

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My computer tower will not turn on. I tried the steps listed on the HP web site, disconnected the power cord, and all cords connected to tower and held power button for 5 seconds, then plugged power cord...


black screen , totally is here,
one page covers this.

http://pcdied.com/black-screen.html


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i am suggesting you the solution keeping in mind that there is no display is on the monitor.
The max ram that HP Pavilion 6630 PC Desktop can support is 256 mb pc 100 or pc 133mhz.
check if you have installed that amount of ram, if thats correct then check if any continues beep sound is coming out of CPU.

if there is beep try to change the ram slot.the more possibilty i either the new ram is faulty or incompatibel.

try to install the old ram see if it works. if still no display.


install old cpu and heat sink.see what happen ..

then let me know the result.

bye & take care..



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may be the connection to the smps is not right 

or may be the fan blew out

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