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CPU Fan start then stop


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#1
kouser007

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Hi, I used my desktop pc for 4 years now , the problem is : when i push the power switch the cpu fan start just for a second then stop , the keyboard light also flash once. No POST or no beeps from the motherboard.
System:
Intel Pentium 4 processor(2.8)
Intel D915GAV motherboard.

The things i tried:
1.Replacing power supply.
2.Replacing motherboard battery.
3.Using another RAM on different slot.
4.Replacing CPU fan with heatsink.

why can't i just hear any beep from motherboard ?? I tried both builtin graphics and PCI express card but nothing on the screen. So the CPU or the motherboard is dead ??
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#2
phillpower2

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:welcome: kouser007

When you tried the MBs integrated video chip did you remove the add on video card?
If not try this.
Remove all Ram and power up, do you get any error beeps?
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#3
kouser007

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Yes I removed add on card and yes tried without RAM. But no beeps. I also tried with empty motherboard but no beeps. Motherboard run the CPU fan, it's power on pin work, power led pin also work. I don't understand what's wrong :(
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#4
phillpower2

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Best couple of suggestions I can make would be first remove the MB and do a barebones set-up on a piece of cardboard (make sure it is larger than the MB) only connect the PSU, integrated video chip, 1 stick of Ram and the keyboard.
IF your MB doesn`t have a power test switch you will then need to short out the 2 power on pins on the MB header to get the PSU to activate, you can use a small flat bladed screwdriver or a paper clip bent into a U shape, this is perfectly safe if you do not touch anything else, the idea is to see if we can get a BIOS screen if you do you can then add one component at a time until you find the problem component, you must power down and remove the power cord from the wall before adding a component, second suggestion try a known working PSU, it is not unknown for new components to be bad, third suggestion try and loan an ordinary PCI graphics card (not pci-e) again to try and get a BIOS screen.

Your own assessment would at present appear correct as in a bad MB or CPU, statistically MBs fail more often than the CPU but obviously there are exceptions.
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#5
kouser007

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yup motherboard is dead. ( In details the whole motherboard is not dead, some power switch or something like that is dead said by one MB repair man.) I think its not a good idea to use repair motherboard.
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#6
phillpower2

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Thanks for the update - Im sorry it was not better news.
A competent tech can be trusted to repair a MB but you would have to compare the cost of this and the cost of a new MB.
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