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Mac Pro won't turn on

I cannot turn on my Mac Pro anymore. It was in sleep mode - monitors only, not HD - and didn't wake up when I pressed a key on the keyboard. So I pushed the power button until the LED went out and then pushed it again to turn on the machine.

The LEDs on the memory banks lit up for a fraction of a second, much shorter than they normally do. A brief whistle sound came on. The UPS display indicated a power draw of 9 Watts, then 8,7,6 and so on until it hit 0. Pressing the power button again didn't do anything. When I removed the power cord and reconnected it again, pressing the power button resulted in the same as above.

This seems to point to the power supply, doesn't it?

Mac Pro 1.1, iBook G4, MacBook, Mac OS X (10.5.8)

Posted on Sep 9, 2010 2:05 PM

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4 replies

Sep 9, 2010 2:33 PM in response to Jens Peermann

Are you saying

You drained your UPS

You leave the side panel off when running or booting

Hope the UPS is 1200-1500VA

A Mac Pro with power cable disconnected (and any others probably) and press power on button for 10 seconds resets the SMC. But should be used only limited fashion.

Recently updated tips on troubleshooting sleep and on resetting SMC:

http://support.apple.com/kb/HT3964

Some tips on display issues that you can try in Single User Mode
http://support.apple.com/kb/HT1573

Hope you find out why, sounds like it has been a recurring problem (heat and dust?)

Mac Pro won't turn on

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