Question about HP Pavilion a785c (82916061390) PC Desktop

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Y computer will not start. I checked the power

Y computer will not start. I checked the power source and it is fine. could it be the motherboard or could it be something else? What can I check before spending money on a new motherboard?

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First, check out the power supply. With the plug out (from the wall, the motherboard and anything else the power supply is connected to). Reconnect to either the hard drive or the CD/DVD. Take the big plug that went to the motherboard, insert a paper clip between pin 14 and ground. (pin 14 is a green wire, ground is any of the many black wires) Plug in the wall power cord. The fan in the power supply should spin normally. If it does, that tells us that the power supply is working. If not, your search may be over.
If the power supply is working, unplug from the wall and remove the paper clip jumper. Then, remove anything connected to the motherboard, CAREFULLY LABELING everything EXCEPT- - -the connection to the front panel switch. A couple of pictures may be a good idea. Reconnect the power plug to the motherboard and the little square plug (4 wires). Plug in the AC and push the switch. If the power supply fan does not turn, it is a safe bet that the motherboard is the problem. If it does turn on, shut it and start adding one item at a time to the board until the problem recurs. That will be the offending part. Ram may need to be added in pairs.
Make sure to unplug from the wall between each step.

Posted on Jul 30, 2009

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Dear Sir,
According to Your problem.
Solution is here
By analysing your problem it seems to be problem with SMPS(Switch Mode Power Supply)it is the power supply part. I think your Computer SMPS is dead,so check with another brand new SMPS. I think it solves your problem. If it is not back with result and more information i will try to assist you in a better way
good luck


Fixya Customer support
chandrashekahr

Posted on Jul 30, 2009

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Some tomes reset bios solve this issue.
So you can reset bios with cmos cell.
Remove cmos cell from motherbord for 5 minutes then refix it .
Also reconnect smps ATX power code to motherbord .
Also check your smps is working fine.
Some times smps has issue may be your motherbord has not issue.

Posted on Jul 30, 2009

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A. check you casing's power supply. if your motherboard's led is lit when the unit is plugged to wall's outlet, then power supply is ok. you can check it in other way using tester or what.

B. Try to unfreeze your cpu. open the case and remove all expansion cards. try to remove the harddisk as well. try to turn on the system with all these stuffs removed ESPECIALLY the hard disk. if it's ok...then you are good.

C. lastly, if B wont work, try to transfer your RAM module to another similar slot. if you have two RAMs, exchange their slots and ty turning the sysytem ON.

Good luck!

Posted on Jul 30, 2009

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Try booting from a rescue CD to see if the harddik is the culprit.
If you don't have one, try making one using instructions found at
http://www.help2go.com/Tutorials/Windows/Create_a_Windows_Boot_CD___Rescue_CD.html

Be sure to set Boot sequence to CD-rom in Bios.

Posted on Jul 30, 2009

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