If you're breadboarding it you will still need to connect the psu 24 and 4 pin connecters as well as the cpu, at least 1 stick of memory in the correct slot. Having a video card on hand will be nice while trouble shooting incase it's the onboard video. Once you connect all that and turn it on what does it do and what doesn't it do? There's a handful of tests so we need to know where to start. Since you tested the psu from his build can you put another psu on that board just to test that part.
And how did you test the memory and it "looks ok" ?
If the board doesn't power up completely it might be the cpu. If it's bad the board won't recognize it so it won't power up. Have you tried going into bios? Also, unplug from the wall and remove the cmos battery for about 10 seconds. Reinstall, plug back up and try turning it on again. Any Results?
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