Asus P5GD1-FMS 775 Intel 915GExp. need help..

Question

ok now this was the upgrade for my custom system when my system suddenly died. i added a new psu and a new mobo this was it. now i still have the same problem a small faint "pts" sound when i press power on and the fans switch on for 1/4th of a sec. led is on..now i think it is the cpu is dead it is an intel pentium4 3.0 cpu which doesnt work with all these replacements. i have some questions. 1 what is wrong with my computer is it the CPU right?.2 will the Asus p5gd1-fms 775 support pentium 4 with 65 nm tech? my old cpu is 90 nm:)

btw i am not a newbie in computers so no the computer isnt shorting the psu amps are checked to support all the upgrades.., i checked all the wires tested the psu mobo ram vid card. thing is the fans spin when the 12 v rail isnt connected so i do think its the cpu but want ur opinions before i replace thanks