Processor Fan Runs Very Fast, No Sig to Monitor, Mouse, Keybord

Hello,
When I turn on my CPU button, The Processor Fans Runs Very Fast and give a lot of Noise.
But
No Signals to Monitor,
Mouse Do not On
Key Board Do not on.

After Turning It off and again On several times, after Sometime it starts again working fine.
When again trun it off and next morning tried to on it I face the same problem.

Kindly help in this matter.
I have P4. Dell OPtiplex 280 with 3.2 processor.