I've recently started building a new computer. I believe I've assembled all 
of the parts and connections correctly. The problem however is that upon 
booting up, the system doesn't past POST. There are no sounds, and no beep. 
There is also no red light showing at all. However all of the fans are 
spinning, and there is a green light on the motherboard, so I know it's 
getting power. My system specs are as follows:

Power Supply: 700W GameXstream
Motherboard: Asus P5N-D
Processor: Intel Core 2 Quad Q6700
RAM: Two 2048MB sticks of DDR2 Corsair RAM.
Graphics Card: Nvidia 8800 GTS
HDD: 500 GB Western Digital Caviar

The HDD, Graphics Card, and Power Supply are from my old system. Now, the 
reason for building a new one in the first place was that my old one was 
having the exact same error. I know the HDD works, because I've tested it in 
another machine. I've also tested the Graphics Card in another machine. Both 
worked flawlessly. I highly doubt it's the Power Supply, because of the 
green light on the motherboard and the fact that all of the fans spin. I 
also doubt the new parts I've ordered were shipped dead on arrival. Hence we 
have a problem that really confuses me. I am getting the same error in my 
new machine as I was having in my old, but the only things that could be the 
problem I'm certain are not.

So, can anybody help me out here?

Jimi Moore 

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