No fun. 
Sending good thoughts.
Things have taken an ugly turn. Internet went out, disconnected cables, turned off Mac Pro 2007. Turned computer back on: power, no chime, no boot, monitor black. Any tips, @jsnell?
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Thanks, but I’m not big on thoughts and prayers.
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I figure if it were the logic board, it wouldn’t turn on. It does. Then nothing.
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Doesn't sound good. Unplug for 30 seconds and then try again. Disconnect all peripherals. But it may be very bad.
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Tried all that. I found one tip: wait 12-24 hours, then plug in and power up. Will try that. Not clear why it was working fine, then voluntarily shut down but then trouble.
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Didn’t those macs have a power management reset button?
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Just googled it. Seems it’s just unplug power chord for 15 seconds, then plug in and turn power on. First thing I did. No evident fan, which supports power supply failure.
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Sounds like the power supply. Maybe also an opportunity to crowdfund a new Mac. I'm sure there are a lot of people who would not hesitate to donate to the cause and I number myself among them.
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DITTO.
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