Power PC G5 Dual 2.5 sudden shutdown and no reboot
Recently I replaced the power supply (blown) from my G5, after that is shows an unpredictable behavior. It is running great for a week, all of a sudden it shutdown the video, ramp up the fans, front white led on. When you reboot, front led light up but turns off quickly, fans start, gongs but suddenly you can see front led turn back on and simultaneously a red led deep inside the machine (not the leds close to RAM) and video never begins and stays there until fans ramp up after a couple of minutes. All leds close to RAM off.
Ran Apple Diag disk and passed all, but when you try a thermal calibration it says either radiator pump error, or to remove/replace clear plastic door.
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Re: Power PC G5 Dual 2.5 sudden shutdown and no reboot
In G5 always the cover should be closed properly if not it will start the fan very fast like a blower and the red leds will be on showing that the heat is over so please check that the cover is closed and locked from behind so itworks smooth and the power supply is standard or normal
u should always use genune parts with mac..
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Check for blown capacitors on the logic board and power supply. If you have signs of blown capacitors you will have to replace logic board or power supply.
The trick is getting the computer open.
Stick a credit card in the back vent at the top of the display.
Their are two tabs one and each side of the vent push forward
unscrew the screws at the bottom.
sit it up facing you and pull the top to you. be careful of the isight cable at the top.
you will need to unscrew the LDC from the housing be careful of connected cables
and check under for the blown caps.
Try unplugging all Firewire/USB devices. Also, unplug the power cord from the computer. This resets the logic board. If that doesn't isolate the problem, put your Original system CD that came with the computer and hold down the C key. Boot up and run Disk Utility. Run the repair disk and then repair disk permissions. Reboot and try booting your system again.
I would be very cautious doing this, if you are not an Apple tech. You can damage the connector for the G5 Processors, and render the machine un-usable.
You have to remove the RAM and Processor, then remove the two power connectors that connect from the power supply to the logic board. On the bottom, underside of the chassis, there are four screws. Remove them, then you can tilt the power supply out of the bottom of the unit.
You most definitely have a video card problem, I have seen it many times. The AHT is different for each Macintosh, which version are you using? let me know the serial number of your computer and the version and I will tell you the correct AHT to use.
Sounds like a bad power supply. They do go bad... get a new one and hook it up without installing it. If it boots your machine...you've solved your problem. That battery retains some boot info and your date/time settings.
There are specialist Mac repairers that can supply parts on the net. You should be able to find one reasonably local to you who will be able to supply you with a replacement as these items can't be reliably repaired.