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Motherboard when i switch on my power supply the cpu fan turns on by it self with out me pressing the powwer botten. (nothing on screen)

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If you use ATX power supply

Follow these steps

Switch on the power supply

Hold the power button approximately for 10 Secs , your system will be switched off. Now switch on the power supply and press the power button to return normal operation.

Some times pressing reset button also solves the problem

If above procedure fails , please check for any loose end connections inside the cabinet. memory slots, any pci slots also check the battery .


Hope this would help
Best of luck

Posted on Jan 29, 2008

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Try replacing the power supply - I had a similar problem that was fixed that way. If that doesn't work, it's probably the motherboard itself. The CPU is also possible - have you overclocked it or otherwise cooked it? Is the CPU cooler/fan blocked with fluff, or has the fan been slow (or stopped) - noisy fan is a sign of bearing stiffness/partial seizure which slows the fan and lets the CPU get too hot. If the CPU is fried, you get the symptoms you describe (MB won't start the PS)

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Disconnect everything from the motherboard except the power supply, CPU and power switch.

Turn on the computer. You should hear 3 beeps because you removed the memory.

If you don't hear any beeps, check the power supply. Check all the connections. Did you connect the 4 pin power? Did you skimp on it? A common mistake is to get a cheap, high-power supply. Just because the box says it's 1000 WATTs doesn't mean that will carry a steady load.

Still nothing...

It's either a bad motherboard or processor. If you have another processor that is supported on that board and you know it works, try it. If it boots return your CPU for a good one.

Unfortunatly, if it doesn't boot with a known-good processor that just proves the board is bad; it doesn't prove your CPU is good. You may have more issues.

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This may work however i think by ignoring the sound of the Fan you might have destroyed the cpu and the motherboard.If you can try the processor in another machine you might just have to replace the motherboard only.
Good Luck

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