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Yeah, a single beep, though very low not like the three beeps issued by a ram problem. It's followed immediately by a whining sound from the fan/cpu and it keeps repeating this say after 3 - 4...

I just bought a new pentium 4 3.0 Ghz motherboard with 256 ram, connected everything as directed on the manual and plugged the power connector then started the computer. The fan starts then nothing...