IS MY CPU DEAD

WHEN I TURN ON COMPUTER THE POWER SUPPLY GOES ON FOR MAYBE 2 SECONDS,THEN TURNS OFF. WHEN I TAKE THE CPU OUT OF THE MOTHERBOARD THE POWER SUPPLY STAYS ON. THIS IS A P4 1.4GHZ/256/400/1.7V PROCESSOR. I WAS PUTTING IN A SLAVE DRIVE , HOOKED IT ALL UP AND TURNED IT ON AND NADA.. NO BEEPS NO VIDEO… I,VE TAKEN EVERTHING OFF THE MOTHERBOARD AND STILL NOTHING.. THE ONLY WAY YHE POWERSUPPLY TURNS ON IS WITHOUT THE CPU… I HAVE TRIED SEVERAL OTHER POWER SUPPLIES AND OTHER P4 MOTHERBOARDS AND STILL NOTHING.. THE CPU IS NOT BROWNED OUT.. ANY SUGGESTIONS