Question about System Power Supplies

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No Power of a Compaq Presario Computer

Power supply is Bestec with 250W Max output, green light on the back flashes when plugged into the motherboard but is solid when mother board plug is removed. 12 Volt is not to problem. System will not power up, tried the power source on another system no power still. Mother board has been replaced. Tried other power supplies and still nothing happens. Any suggestions?

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Make sure that the power button is conected to the right prongs on the mother board. On the writing next to the prongs it should say power.

Posted on Feb 24, 2008

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Power light on computer flashes..tried the trouble shooting advice w no results. Bestec power supply model atx 250-12z. Unplugged computer to clean and now wont turn on..No fan no nothing..Just a green...


If you didn't accidentally unplug the four pin connector near the CPU, you need to replace the power supply. This is actually a fairly common occurrence with the cheap ATX power supplies being tossed into systems these days.

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Google Search Terms: 20 to 24 pin adapter

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Hi. NO, *********** board is not fried. I am not sure what the problem is but I do know how to fix it. It is usually casued by power outages (even if you have UPS supply).

1. TAKE OUT THE ELECTRICITY LEAD TO THE COMPUTER. Look inside the computer and find the bunch of wires coming from the power supply unit (the box thing at the top with the fan and all those colouted wires!).

2. Find where these wires run into a plastic connector and plug into the mother board. Unplug it.

3. Now plug the electicity lead back into the computer. The light should now stay ON.

4. Plug in the connector again... and boot up. Leave it run a while to convince it!

5. Repeat this process if it does not work first time.

This should fix your problem . It works for me when I get this problem.

Friend in Spain

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The described problem might not be the Power Supply Unit, there are a number of different reasons that may cause this symptom. Consulting HP would be advisable.

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