My Mac G5 won't power up. Checked the cord continuity-good. Checked the power from the wall-good. Yet, when I press the button on the front of the box-nothing. Don't know if the problem is a fried power supply or the switch. I have a multimeter, can someone walk me through troubleshooting? Thanks.

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Try holding down the power button on your G5. If that doesn't work, check that the button actually is connected to the computer. Yes- that means you will have to open up your computer, but it is a risk you might have to take.

I have the exact problem with my machine. Basically the power button has a loose connection. I give the front of the machine a hard slap with the palmof my hand and usually the power switch works. I've looked at the switch, but haven't got round to replacing it yet.

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