My Mac G5 has shutdown unexptedly and now won't power up. There is no response at all to pressing the startup button. I have unplugged it and reseated all the RAM but it still won't power up. I have checked the battery (which is a round barrel shape 3.6v not a flat round type) on a meter and it shows a poor charge, is it likely this is the problem?
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.
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Hold down the power button until the computer shuts off. The press the button to restart and see what happens. There are several different ways to startup. immediately upon hearing the boot tone, press and hold the shift key to boot in safemode. If this fails as well, then you will need to boot with the install CD. This is done by immediately pressing holding the C key upon powerup
Hello You can check your hard drive's health at startup pressing command-s. you will see a black screen with white text. simply type "fsck -f" and press return. It should check your drive and tell you if something goes wrong with it, and repair it if possible. Then type "reboot" and press enter to test. It this does not help, you can press the shift key at startup. It does the same thing, but also disables the extensions at startup, this will help you to find out what the problem is. The startup will be longer and it should ask for your admin password. If this still doesn't help, you might have a hardware problem (hard drive). You can try to backup your data, erase the disk and reinstall the system. To backup you need another Mac, and a firewire cable. Press the "T" button at startup, this should set the Mac in "target" mode, allowing you to use it as an external hard drive. Then connect the firewire cable between the two macs. On the mac that is OK, you should see the hard drive icon of the other mac... Hope that you will succeed and that it helped you someway
By pressing and holding down the power key for about ten seconds on the front of the G5 you can perform a hard shutdown although you will have lost any changes on any open documents. Once the machine has shutdown you can then restart per normal. Hope this helps.
there is the single user start-up, which you were thinking of. There is also a safe-boot for macs.
To start up into Safe Mode (to Safe Boot), do this:
1. Be sure the computer is shut down.
2. Press the power button.
3. Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone but not before.
4. Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
During startup in Mac OS X 10.4 or later, you will see "Safe Boot" on the login window, which appears even if you normally log in automatically.
During startup in Mac OS X 10.2 through 10.3.9, you will see "Safe Boot" on the Mac OS X startup screen.
To leave Safe Mode in any version of Mac OS X, restart the computer normally, without holding any keys during startup.
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..
Start your computer by holding down the option key before pressing the start button. This should give you an option to choose which startup disc to use when starting the computer. Once it's restarted, go to the System Preferences and choose the specific startup disc that you want to use.