P4sd-vl Fitted In Sony Pcv-rs406 No Boot Up

[siddler]

Hi all.

My first post....My computer will not boot up....the MOB led lights up...I took all the cards out but still no joy.

I took the ram out and powered up and can hear 3 beeps which continues until I power off....when every thing is replaced I cannot hear any beeps the fans are active as is the blue Vaio Logo on the front panel...any help would be appricated.

Thanks......siddler