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TRY TO REMOVE THE RAM MODULE AND CLEAN THE SLOTS THAN REMOVE THE CMOS BATTERY ON THE MOBO FOR A FEW MINUTES THAN PUT BACK CMOS AND RAM AND SEE WHAT HAPPENS IF THIS NOT HELP MAY BE THE PROBLEM IS IN YOUR HARD DISK TRY TO CHANGE THE INTERFACE CABLE BETWEEN THE HARD DISK AND MOBO AND TRY TO BOOT AGAIN :)
I know, this is a very frustrating situation... Unfortunately, the only reasonable way to find out what's wrong is to swap components with a reference system, until you found the defective part. I hope you have another P3 system available to swap parts.
I would do it this way:
First check that the power button is connected correctly.
Swap the memory from the faulty system to the reference system.
If ok, put it back into the faulty system and connect the power
supply from the reference system (or some other known good one) to the
If this doensn't help, swap the CPU from the faulty system to the reference system.
If the CPU is ok, the motherboard seems to be defective.
turn off the pc and remove the side cover, locate the memory module, and reseat it (remove and put it back). power on the pc. Still not working?
off again, remove the memory modules again and clean its gold plated contacts by using an eraser (the pencil eraser) then put it back again. power on. still not working? do 1 and 2 several times. (make sure that the memory modules are good)
If several times has not worked, try to isolate the problem by removing all the connectors except. 20/24 pin power connector, the vga cable, front panel leds and switch. do 1 and 2 again.
still not working? check your motherboard connections and review your work?
I have built quite a few PCs and I have often found the same problem when trying to boot for the first time. An old trick that might help is to repeatedly energize then drain the PC electricity. Do this by plugging in the PC momentarily then unplugging it then immediately pressing the power button on the PC while there is no power hooked up. Do this several times over and over again in quick succession. Finally turning on the PC with the power connected. If the power supply on the PC has a switch on it you may use that instead of actually plugging and unplugging. Also you might try pressing and holding down the "ins" or "insert" key while powering on the PC. Hope this helps.
Same configuration? (Same: Mobo, Processor, Hard Drive?) Just new case and cables? Do you have onboard sound, are you running a sound card, or perhaps you're plugged into a fancy graphics card sound port?. Try these configuration tips before you tear it all apart: Check your device manager in the system section and make sure your intended sound device is operational with no (!), or (?) alerts next to it. Reinstall any mobo, graphics card, or sound card drivers which run your sound device. AND finally, if you have more than one sound device on your computer (mine has all 3 options I described), make SURE you have the right one selected in your sound manager!
try to look on the jumper settings on the motherboard before you upgrade your proccessor maybe they need to be adjusted.tryb to put back the one wich was there and see what happens.how many beeps does your computer makes when you switch in on?if it makes more than one then your proccessor is not compatible with the board.a computer should beep once whenevever its switched on