Asus A8N-SLi SE nForce4 SLi problems

[pham]

hi guys, my Asus A8N-SLi SE nForce4 SLi (Socket 939) and AMD Opteron UP 144 San Diego 1.8GHz arrived yesterday.Set everything up , pressed the power button and then i start hearing beeping nosieys(bad signs) and not even a bios boot up.
checked everyhthing and even stripped it down to motherboard, processor and ram, but still the same : (
I know the processor and ram is working because i tryed it on my old board.
so i phone the helpline and they said it could be the power the supply or the ram or motherboard.The power supply that im useing is a 450watts which came with the case and my ram are ome pc333s from my old boardl
power supply? does the" Asus A8N-SLi SE " really need that much power?
ram? is this motherboard really that picky what ram i use?
Anyway for my peace of mind ive ordered Corsair 2GB DDR XMS4000PT TwinX (2x1GB) and Akasa Ultra Quiet 460W Paxpower Active PFC for around £200 and if i find out that is my motherboard then im going to kick some butt!!!!

if anyone else had this problem please tell me

[H3X4D3C1M4L]

My friend's PC kept crashing and dying when he upgraded his system then he got a new PSU and was happy till he fried his CPU. So it might be likely....but I don't know how a new mobo would cause a PSU overload...as long as the rest of the components are the same