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Hi,
There are a couple of places to start. Here is what I would do or where I would look first:
First, make sure you have the CPU/heatsink fan connected to the motherboard. Then make sure you have not only the ATX plug connected, but also the 12 volt square (molex) plug connected to the motherboard, the on/off switch hooked up, and then try it.
If nothing, take the on/off wire from the case to the motherboard and short between those pins to see if the switch is functioning properly.
If nothing then suspect that you have a short either between the motherboard sides and the back plate, the PCI (metal) covers for unused PCI ports, actual PCI card plates, or between the motherboard and the motherboard posts. If you see nothing visually, the continue searching.
(1) Take all cards out, all drives unconnected, no video card, leave in only one stick of memory, the CPU, the heatsink and fan connected to the motherboard, the keyboard, try it and see what happens. If it comes on and stays on, then put the video card in and try it. If it stays on, then put it back together, piece by piece and testing as you go by trying it after each new piece is put back.
If this does not yield any results, take the mother board out of the case and put it on a non-conductive surface beside the case and go back to buildng it like step #1 above. If it works, then look for a misplaced motherboard post or shorting on the case and solve that problem before you put it back in piece by piece, testing while you add each component.
That is where I would begin with this unit.
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