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Tom, Mac Support Specialist
Category: Mac
Satisfied Customers: 675
Experience:  8 years experience as a Mac administrator for a college
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Hi, I have a G5 tower. Its been running exceptionally until

Resolved Question:

Hi, I have a G5 tower. It's been running exceptionally until about 20 mins ago. I heard a sizzling then the computer shut off. I tried rebooting. The on switch shows the white LED then shuts off immediately. Would appreciate any ideas. Thanks, Donella
Submitted: 6 years ago.
Category: Mac
Expert:  Tom replied 6 years ago.
HelloCustomerand thanks for using

Try to unplug the G5 from the power outlet for 5 minutes.

Let me know if it powers up.
Customer: replied 6 years ago.
same thing happened after I plugged it back in:
Customer: replied 6 years ago.
Hi Tom we already did that, same things happen
Customer: replied 6 years ago.
Hi Tom we already did that, same things happen

Expert:  Tom replied 6 years ago.
If you are comfortable opening the case you could also try to reset the smu (power management)

  1. Turn off the computer by selecting Shut Down from the Apple menu or by holding the power button until the computer turns off.
  2. Open and remove both the metallic outer door and the inner plastic air deflector.
  3. Remove the fan assembly immediately to the left of the processor module.
  4. Press the SMU reset button on the logic board.
  5. Replace the fan assembly, air deflector, and outer door.
  6. Turn on the computer.
I have included what this button would look like.

Unfortunately if that does not work it would be the power supply. You can look for the closest apple service provider to you at the link below.
Customer: replied 6 years ago.
This also did not work: there is also radiator fluid leaking out ...
Expert:  Tom replied 6 years ago.
It is a hardware issue. You will need to bring it to an apple service center.

As I stated above, there is a link here to find someone close to you.
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