No power at all

August 14, 2011 at 21:13:38
Specs: Windows Server 2003/Arch Linux
One of my relatives gave me their computer with the description that it was not turning on. It is an HP Pavilion s3200n slimline. I noted the problem and tried the following.

First I took the case apart and verified with my multimeter that the power switch was working properly. It was: the switch press can be detected at the front panel connector.

Next I took out the power supply. Making sure to short the PS_ON and a ground pin, I verified that all voltages were correct at the ATX connector. The appropriate pins were reading 3.3, 5 and 12 volts. The power supply fan also turns on.

However, when I connect the power supply to the motherboard and press the on switch, the power supply does not turn on. The fan does not move and there is no voltage on the other ATX pins. The same happens if I just short the power pins on the front panel connector with a screwdriver.

Note that I cannot test a different power supply on this computer since it uses a smaller ATX connector (still 24 pin, only the pins are smaller) than the power supply in my own computer.

The motherboard is an Asus M2N61-AR, which appears to be custom made for HP. Is there any way to test the motherboard itself? I have looked closely at it and do not see anything burnt out or any leaking capacitors.

Any ideas?

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August 14, 2011 at 22:32:27
Bad board(with working CPU & RAM) + working PSU = system start & blank screen
Bad PSU + working board(with working CPU & RAM) = system start & blank screen or nothing
Use this adapter

We can not fight new wars with old weapons, let he who desires peace prepare for war - PROPHET.

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August 15, 2011 at 08:35:33
But the system does not start at all! The CPU fan does not turn on. Is there anything I can do without ordering adapters?

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October 4, 2011 at 08:52:04
An update for this old thread!

I finally bought the aforementioned adapter from Amazon. When it arrived, I took a power supply known to work, rated at 250W (the HP's is a 160W), and connected it using the adapter. The computer started right up!

Then, after a few seconds, I noticed a plume of smoke coming from one of the chips on the motherboard. I quickly shut off the power. The chip, labeled "1394 LINK/PHY", was extremely hot, as were a number of capacitors and other chips, that had not started to smoke.

Is the motherboard bad? If so, why did it start up with the new power supply and not the old one?

Is the old power supply bad? If so, why did the motherboard start burning up with the new power supply?

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