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Your processor fan is designed to run in response to the temperature sensor thats on the motherboard. If it's running too fast, it's likely your processor is running too hot. Make sure the case has adequate ventilation and is clear of dust and debris.
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Remove/disconnect everything (Ram, Cables, Power Supply, Battery, Processor, Pci cards, Display cards if there's one, etc.) from the motherboard, and after while, reconnect/put them on the motherboard again. Make sure you correctly installed the Ram and it's working. Also don't forget to connect both the power supply cables (20 pins connector and 4 pins connector) to the board. Now reboot your system, can you hear anything (beeps)? If this doesn't help, your nearest culprit to the problem is Display card. Good luck
It's a bad power supply. Couldn't be a bad Power On switch, because it turns on for 2 seconds.
You have to have Ram to get the computer to function, besides the processor. All you will see is the BIOS Setup screen.
Been using the same power supply?
The power supply has bad Electrolytic Capacitors in it. These bad 'Caps' in turn make a weak voltage rail. You have three main voltage rails inside a computer power supply. The 3.3 volt rail, the 5 volt rail, and the 12 volt rail.
With a weak voltage rail, the processor won't have enough power to run. ALL the lights, (Lamps), use less than 1 Watt. EACH fan uses 2 to 3 Watts. Processors use 55 watts to 125 Watts. Depends on the processor.
You probably need to check the cooling fan setup ( some motherboards give the control on the task manager or a sperate software to control it) This seems to be a problem of overheating which might have started after the installation of new ram.
first of all you should know that even though pentium 4 isn't that old there are still some problems, for example the d processor uses sd-ram or ddr1 ram which are much slower that ddr2 and ddr3 "ddr1 isn't that slow" but if u're using SD-ram then u might wanna upgrade your rams a bit.
Most modern motherboards include temperature sensors that can speed up or slow down the CPU fan depending on how hot the processor is.
If its noisier than it was originally it could be:
-inefficient cooling caused by dust accumulating in the heatsink under the fan.
-could be heat buildup in the case itself causing the processor to run hot.
-could just be noisier because the bearing in the CPU fan is wearing out.
-Make sure the CPU fan power cable is plugged into the proper socket. If it?s not the motherboard cannot control the speed.
Let us know if you have any other questions.