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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.
Do you have the Apple Hardware Test Utilities Disk. If so, restart the computer with that cd inside. It will do a diagnostic and determine if there is a defect with the hardware.
If not, power off the computer. Wait about 2 minutes. Then press and hold down the power button til you hear a long beep noise. then release. allow computer to finish booting up. Then do a sound test again.
let me know if this helps.
Insert the system CD, restart the computer holding down the C key until it boots using the CD. Then run through the initial screens as though you are going to reload the system software until you are given a menu bar. Select Disk Utility from the menu bar when you can and then you can run disk first aid and 'Repair disk'. If this works OK then you are back up and running after a restart. Otherwise you will have to reload the system. Note: when you have booted of the CD, you should be able to access the hard disk and retrieve any files you want first to an external disk or memory stick before reinstalling the system software. Good luck - TT
When you ran diagnostics, were you starting up from the AppleCare CD/DVD (or whichever diagnostics disc it was)? If you were and the system didn't crash, that would likely point to a software problem causing your trouble. Have you tried booting up in 'safe mode' by holding down the SHIFT key? That would be my next troubleshooting step. Also, what computer is this?
This can often be fixed using a tool like Disk Warrior, but you will have to have another Mac to make the repair. See if you can boot into Firewire target mode (by holding down the T key while starting up the computer. You will get a big Firewire icon on the screen if this work. If you can do this, then you can attach the computer to another Mac using a firewire cable and use disk utilities to check out your disk and attempt to repair it. My experience is that Apple's disk repair will rarely fix this, but Disk Warrior almost always will.