Power supply light flashes

[wjcemt]

 My presario sr1300sx desktop will not start and the power supply light flashes when I connect power. I used the online help to determine that my power supply is good. But when I reconnect the power supply to the motherboard the light flashes again. Does this mean the mother board is bad? If so is it worth replacing?

[Big_Dave]

Hi,

Try this procedure and see if you can isolate the issue. Trouble Shooting Power Supply Issues. Don’t skip any steps.

There might be other components that are causing the issue. 

[wjcemt]

Thanks Big Dave; This is the procedure I use to determine the power supply is still good.

[Big_Dave]

Hi,

Did you unplug all of the internal components per the troubleshooting procedure? 

After the components are disconnected:

• If the LED is on solid and is not flashing, the power supply is probably good and the problem is most likely caused by a defective component (processor, memory, PCI card) or a defective motherboard. Have the computer serviced, or remove the components and replace them, one at a time, to find and replace the defective component.

• If the LED is still flashing (it should not flash with all connectors removed), plug the power cable into a different power outlet that is known to be good. If the LED still flashes, the power supply should be replaced.

Your local competent PC repair shop should have a bench power supply and a motherboard tester.  You have a fairly old PC so if the motherboard tests indicate a bad motherboard then you should consider a new PC.