I always default to PSU in a situation like that. A bad PSU can definitely fire up the computer and spin the fans but not POST.
Try a known good PSU before you get too angry.
If not that, then try known good ram, then next is CPU/MOBO
edit: I see you tried PSU. But your saying mobo is DOA now?
Have you tried a known working processor? Whats the socket? I might have something that will fit it just to test.
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