Question about Apple iMac G4 Desktop

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Power button not responding

After moving cpu from floor to desktop (unplugged all cords prior to move) the mac does not power on. Absolutely no response, as if it is dead.

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Carefully check all the wires to be properly seated in to their respective connectors. Make sure you did not cross any connections by accident.

If the above fails and the warranty is finished on the computer, you can take the chance to open it yourself and see if there are any connectors that become loose.

If all the above fails, you will have to bring the computer to the MAC dealer for service.

Jerry G.



Posted on Jul 08, 2008

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Posted on Jan 02, 2017

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First step would be to Reset Your Mac's SMC
The method for resetting your Mac's SMC depends on the type of Mac you have. All SMC reset instructions require shutting down your Mac first. If your Mac fails to shut down, try pressing and holding the power button until the Mac shuts down, which usually takes 10 seconds or so.

Mac portables with user-removable batteries (MacBook and most MacBook Pros):

1.Shut down your Mac.
2.Disconnect your Mac portable from its MagSafe connector.
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4.Press and hold the power button for at least 5 seconds.
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Mac portables with non-user-removable batteries (MacBook Air and some late 2009 MacBook Pro models):

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Mac desktops (Mac Pro, iMac, Mac mini):

1.Shut down your Mac.
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Alternative SMC reset for Mac Pro:

If you have a Mac Pro that isn't responding to the normal SMC reset as described above, you can force a manual SMC reset by using the SMC reset button located on the Mac Pro's motherboard.

1.Shut down your Mac.
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5.Close the Mac Pro's side door.
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Now that you have reset the SMC on your Mac, it should be back to operating as you expect. If the SMC reset didn't fix your problems, you can try combining it with a PRAM reset. Although the PRAM works differently than the SMC, it can, depending on your Mac model, store a few bits of information that the SMC uses.

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This was straight from a Bretford tech:

There are no capacitors or anything that can hold a charge on the cart itself. The only thing that we've been able to come up with thus far is that dry air in the schools may help generating static electricity. Common precautions would be 1. make sure the ground plug is still on the cord. (This can get broken off if the cart is moved with the cord still plugged into the wall.) Plugging the ground cord in won't help however if the person has to grab the door handle to open the door to get to the wall outlet. 2. If the air is dry (ie: people get shocks even without the cart or the problem goes away in the spring when the humidity goes up), gently push the metal of the cart handle against the door frame prior to reaching for the door handle. This will discharge any static electricity that was built up as the person walked with the cart safely to the door jamb prior to the person reaching for the door handle.

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When you moved your pc you probably knocked the graphics card loose. You can open it up and try re-seating it. Make sure you unplug the pc first and then press the on button for 10 seconds to clear out all the power from the power supply before opening the computer up.

Also, If you are using a KVM... Unplug the KVM's power cord for 30 seconds and plug it back in. That will reset it.

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Any lights at all? try swapping a printer power cord or another power cable on it. Does the fan on power supply move? CPU fan moving?
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might as well do a reset:
for partial reset:
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for semi-full reset:
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Moving within page with columns


What program are you using? The answer may be different if you are using a Microsoft product, vs an Apple product, on your Mac.

Have you tried shutting down and restarting your Mac?

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