What Model number do you have and all that good stuff??? If you have the board Installed it should be a white Plastic female connection almost on the bottom left side of the board.... let me know the basic info on your MOBO and i can give you a better Idea....
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here is a pic look at the right top right side there is a 4 pin power plug and make sure that you have the cpu fan wires to the cpu plugin it says cpufan on board ok http://www.asus.com/Motherboards/P5PEVM/
try and find the installation manual for the exact model of system board and verify if the front panel connectors on the system board have been connected correctly. i suspect you might have inversed the power btn and power led cables. if this is not the case, then you might want to reset your power management settings in the BIOS setup.
Here is the diagram that shows you how to hook up the wires:
If you still have no video then reseat the memory one stick at a time in one slot at a time.
If you still have no video then reseat the cpu into its slot.
If still no luck try a different stick of RAM by trying it one slot a time.
Last step, unhook the power connectors from your device so the only power connectors that are connected are the power to the motherboard and the p4 connector to the motheboard. Also make sure your power supply is set to 115v. Its the red switch on the back of the power supply.
If none of this works, then the motherboard is bad. Hope this information helps.
Kindly check the connection from the front power button to the motherboard. The front power button wire may not be plugged into the correct jumper.
if that wire is hooked correctly, remove the memory modules from the system and all other wires from the board , except the power supply connectors to the board and then power it on , check the status of the light on the power button.
if you can provide us with the model number of the motherboard , we would be able to help you better
I understand how this must be driving you nuts. What I am going to suggest might sound stupid but I have to ask. After your assembly was finished (1st time around) did you check the 4-pin ATX + 12volt connector was correctly & fully inserted into the board? Pg. 2-28 section 6. in your manual? Did you add thermal grease to the CPU. A bad pin on the CPU will give you this symptom. I completly understand if you do not agree with this next part but it is extreamly important you go with it. Take the static bag your board was wrapped in & lay it on a table. Place a piece of foam on the static wrap & place your motherboard on the foam. You can use books instead. Connect your PSU, CPU heatsink & fan, Hd & video card & 1dimm to motherboard. Connect mouse, keyboard & monitor.
Check that PSU is set for 115v (small red slide switch near the off/on toggle switch). Plug in the PSU to outlet.
If the green led on board lights up you have power to board. This is known as a standby led. If it's not on, flip the toggle switch on the PSU to on.
Use a pen to short the power switch. This will turn on the board, no different than you pressing the power button on your case. Goto pg. 2-30 in your manual. Find PWRSW two pins. If the system starts up than somewhere durring install the board was shorted to the case.