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Mac Problems I have a G4 mac. It will boot sometimes, but after it comes on it will shutdown by itself. Sometimes, I can hear the fans running anf then they will shut down. Now, I can not get the system to boot at all..When I push the button to turn it on, the button is lit as long as I keep it depressed, but when I turn it lose, the system doe nothing...Please help

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You may need a new PSU.

Posted on Feb 13, 2010

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Powerbook g4


If you have the operating systems disk, you can boot from the disc, and once the setup come dump, choose password reset from the "utilities" drop down menu. Change your password, shutdown, and reboot.

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Thank for contacting Fixya, I will be glad to assist you.

Here are some steps you can try to resolve the issue:
• First, hold in your power button for approximately 10 seconds to do a hard shutdown.

• Once your Mac is shutdown, you will need to perform what is called a PRAM reset (Parameter RAM)

• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously .

• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.

• Now, hold the keys down until the computer restarts and you hear the startup sound for the third time.

• Release the keys and allow the Mac to start up.

If neither of these processes do not work, have your RAM memory checked, as this could be a factor in your G4 not booting up.

One other factor to consider, especially given consideration of the flashing light and no boot up, depending on the type of G4 mac you have, would be the power supply, which is what gives your G4 the power to boot up and function.

Hope this helps.

Regards,

-The MacTechTrainer

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Try booting from the install disc. by holding down the "C" on the keyboard. If it boots normally from the disc you have a hard drive problem and it will need to be replaced.
If it doesn't boot normally from the disc you have a logic board problem and it will be needing to be replaced.

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1 Answer

My powerbook G4 does not chime!!


I suggest you plug it into AC power, then boot with Command-P-R held down until you hear the unit chime twice, then release it. Hopefully, it will boot after this.
If not, boot with Command-O-F held down; when you reach the command line, type
reset-nvram [return-key]
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If it doesn't boot after that, you have deeper issues if the machine is actually turning itself on and off.

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Sounds like your machine is overheating big time. You didnt say if it boots up or not, but I wouldnt keep trying until someone can look at it. You probably need a new fan, possibly hard drive, hopefully not mother board.

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hm, try leaving it on over night, sometimes if you turn your laptop of from the power or hold down the power button when allot of programs are running or if you get the program not responding thing happen this can mess up your laptop and will take ages to boot up,
or it might never boot again
so you will need to take the install cd/dvd that came with the laptop, insert it into your laptop, reset it again, then as u hear that sound apples make as you turn it on, hold down C untill it boots into the cd/dvd then go from there.

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Have you looked into System Preferences>energy saver>schedule? Maybe it's set up to start itself. I have my mother's mac set to start up and shut down automatically. Just a thought.  

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Try booting the MAC OS disk. If it boots correctly, it probably is the hard drive. Also, If it boots ok, try the repair utility on the cd.

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

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Freezing is a HD problem. Do you hear clicking sometimes? Sometimes on boot up is there a foler with a questionmark in it? I would get your hard drive looked at, this is the reason disc utility fails. Your hard drive has a hiccup.

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