Sweet, so you have a compatible CPU and a respectable power supply
Next, and I apologize if these are insulting questions
1) is the mobo mounted on top of
standoffs, and are you sure there are exactly the same number of standoffs as the mobo has holes
2) is the
ATX12V cable plugged in
3) is the mobo's
CLRTC jumper in the Normal position like it should be
4) have you checked to ensure that the springy finger things on the rear I/O shield aren't getting into the USB ports or network jack
5) is the AGP card definitely bottomed out in both the top and bottom layer of contacts in the slot
6) are the memory modules in the blue slots (if you use just one, use slot
DIMM_B1, third from left)
7) if you plug headphones or powered speakers into the green audio-out jack, do you hear the speech diagnostics saying anything?
8) check that the PSU is set for the right voltage for your locale (115 volts or 230 volts) on its slider on the rear
9) If all else fails, take the mobo out of the case and lay it on cardboard, then test it with only the absolute essentials: CPU/heatsink/fan, one memory module, video card. No drives, no case wires except power button, no keyboard, etc.
10) If it won't run on cardboard, try to verify the video card and memory as working in a known-working computer if possible, and consider testing the power supply as well. That would pretty much narrow it down to CPU and mobo if all the other stuff worked in another computer.
Hope that's some help
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