Hi,guys my g4 imac is frozen. I've done numerous things,like restart on v mode or single mode.The imac tells me the problem,which is memory!If i take the four screws of the bottom and install a memory card.Should that help? Thanks Bobby from Houston,TX
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You may have to go to single user mode and start from the terminal. Difficult. Otherwise, zap the p-ram by holding down the Apple Option, P and R kets at the same time after you here the chime. This should reset enough to get you running. Maybe. Or, hold down the shift key will restarting to start in safe mode. Or, hold down the option key will restarting and select your start-up drive from the menu,
You could try resetting the PRAM which resets various things to default status. You do this by holding down the following 4 keys together "cmd" "option" "P" "R" at the startup sound, keep them held down until it restarts and keep holding them down until you hear the startup sound 2 more times and then let go.
If that does not work try booting up in safe mode by holding down the shift key at startup and then when it boots up change the resolution to one that works and then restart.
If Safe Mode comes up alright, I would install AppleJack, excellent troubleshooting article can be found here... Troubleshooting Tools: AppleJack Another excellent free tool for performing maintenance is Onyx (be sure to download the right version for your system). Install the package, then run it, it will check your drive and the structure, after this, click on the automation tab and check on everything for Maintenance, Clear Cache, Cleaning, and check on Reset -> LaunchServices database and Mail's Envelope Index. When it completes, restart. Repeat any time something seems flaky, if not try to run at least once a month.
Try holding down the shift key after you hear the startup chime. This should start the Mac in Safe Mode and force some cleanup utilities to run. (Note that startup takes a bit longer than usual in Safe Mode.)
The login screen should show the words Safe Mode in red when startup is done. You can then restart and the Mac should boot normally.
Try turning it on with the shift key down. This gives a safe boot. If it's going to turn on at all, it will turn on then. Also, boot it with Disc Warrior or Tech Tools and run some tests to see what is going on. I hope you find all is well, and that the repairs are just minor. Good luck.