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Some more stuff I've tried:
cleared the CMOS
unplugged the front USB (read about USB stuff maybe causing a problem)
made sure the motherboard was screwed tightly onto the risers
Interesting note (at least to me) was that I turned the computer on while the CMOS jumper was set to the "Clear CMOS" setting (on pins 2 and 3 vs 1 and 2 for normal operation) and it turned on, with fans running and nothing on the monitor, but without any beeping. Any significance to that?
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