|With the power cord removed, temporarily disconnect all the drives and remove any unneeded cards. Disconnect any USB devices. Check that the cpu and its heatink/fan assembly are firmly attached. Then plug the power cord back in and see if it powers up. If so then likely one of the disconnected devices is at fault. |
If not then yeah, since you've tried another power supply--a known working compatible one?--the motherboard is the next most likely reason.
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