I have a desktop PC that is now refusing to switch on properly. The fan will come on, but then about 3 to 5 seconds later it shuts down. Pressing the power on button a second time does nothing, not even getting few seconds of the fan running. But if I pull out the power cable and plug it in again, then the power on button does work again - though again only for a few seconds.
Any ideas?
Answer
As other have said, lower the load. Try with only motherboard and HDD connected. Also, check the inside of your computer for any places where exposed wires or solder joints may touch the case. To me it looks like the problem may be short-circuit protection kicking in after few seconds.
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