Asus P4T-M version 1.05 Not Posting?

Hi there,
I'm trying to put this very old system together and for some reason it will not post? The System fires up , Cpu and Video fans spin. There is no beeps coming from speaker though? It will not post into bios screen. Only things Attached are vid card, memory, cpu, and one hard drive. I have power to the main plug but not to the p4 plug. Even though asus recommends the four pin power to be hooked up, I do not think this is the problem and the power supply doesn't have the P4 power cable and plug coming from it. The vid card works in another system. Unfortunately I can not attest to the workings of the memory, I got given 2 x Asus P4T-M Mobos, one with 2xsticks of 128mb (each Rimm) and One with a single 128mb stick plus the C-Rimm sticks needed to fill the unused slots. One thing I did find curiuos was one of the mobos prefers it's "Clear cmos" settings on 2-3, (According to the manual 2-3 = Clear and 1-2 = default normal operation) otherwise it never wants to shutdown and restarts when I release the power button after 5 secs?
Any Ideas? many thanx in advance. Regards Ed. (21st March.2008).