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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.
Could be a lot of things. Try running Disk Utility from your install DVD:
After that, if issues persist, try booting in Safe Boot Mode:
http://support.apple.com/kb/ht1455 If the issue is resolved in Safe Boot, try removing third party startup items: http://www.thexlab.com/faqs/startupitems.html
If the issue persists in Safe Boot mode, try a new user. http://docs.info.apple.com/article.html?path=Mac/10.5/en/8235.html If issue is resolved in a new user, then you know it's something just in your user. Delete the contents of the following, where ~ represents your user's home folder: ~/Library/Launch Agents ~/Library/Launch Daemons ~/Library/Startup Items ~/Library/Caches
This will usually resolve the issue.
If it persists in the new user, then the issue is likely with the operating system itself. At this point you should Archive and Install:
First hold down the right hand shift key down when you start, this does some housekeeping, The next step is if you have an install disk or tiger disk then start up from it by holding the "C" key down when starting and inserting the dvd, if this loads then go through the install menu, dont worry you do not need to actualy install just select language and then you get to a screen where you can select utilities from the menu bar, then select disk utility and repair permissions, after that do a repair disk then quit disk utility and change the startup disk back to the hard drive and restart, if for some reason you cannot repair the disk, this refers to the catalogs it uses to keep track , not the data itaelf, in that case you need a 3rd party utility like Disk warrior.
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?