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No power or boot on Compaq desktop


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#1 geno368

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Posted 31 October 2012 - 01:54 PM

I am working on an Compaq SR5233 running Vista H/P with 2gb ram. I am getting no response when power switch is pressed. I did the standard gem clip test and the power supply fan runs and voltages are good. I also installed a known good p/s with same results. I then tested the power switch by shorting the red and black power wires and tested continuity and get connection when holding it on. Possibly bad; so I attached them together and plugged it back in to the M/B; put in power cord..still no response.
One other thing seems strange: I unplugged the 24 pin m/b connector and plugged in the 4 pin m/b connector and I am getting a solid green light on the p/s and then when I plug in the 24 pin the light blinks rapidly and very faint. I unplugged the H/D and dvd drive also.
I am thinking motherboard...Any thoughts? Thanks in advance

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#2 Hadnjury

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Posted 31 October 2012 - 09:32 PM

Hello Geno368, try unplugging the power supply from the power source, hold the power button down for 30 seconds to discharge the capacitors. Plug it back up and see if you can power on. Also take a look at the capacitors to see if any of them are swollen or tops burnt. Take a look at the memory as well and make sure they are not discolored, usually they turn a brownish color.
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#3 geno368

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Posted 01 November 2012 - 06:57 AM

Thanks for the reply. I have done that with same results although I did find one capacitor slightly bulged. The memory looks fine but I think if it were bad it would still power up wouldn't it?

#4 Hadnjury

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Posted 01 November 2012 - 12:00 PM

The memory being burnt could also result in a non boot. The discoloration would be apparent if the memory was burnt. Based on what you have already tried, I would have to agree that it is the motherboard
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#5 computerxpds

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Posted 01 November 2012 - 12:32 PM

Yeah I would go with it being the mobo as well, if it doesn't work with a good known PSU then I would say it has to be the mobo. I would take all ram sticks out and see if it powers up, also make sure its dust free, sometimes dust can cause a short somewhere.
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#6 geno368

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Posted 01 November 2012 - 01:30 PM

Thanks again...I did remove the ram with same results. I will find a board and let you know.




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