Hi, maybe you should download a manual.
From here:
http://www.asus.com/Motherboards/Intel_Socket_478/P4P800VM/#download
Just to check you have connected everything right.
First select your operating system.
Select manual and click on global for download.
The file has to be unziped before you can read it.
Have you installed the ram module and cpu correct ??
If you have installed a wrong type of ram it will not boot at all.
Does it makes any beep sound ??
Is the powersupply ok ??
If you are useing the onboard graphic check for loose connections.
Check with the manual that all connections are in order.
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