i hav an ibook g4 bought in 2006. everythin was fine but eventually my ibook started freezing and asks me to shut down the system by pressing on the power button. while booting at times it says da same as above and now my airport is not working whenever i activate airport it freezes and says shut down the system by pressing on the power button.
please suggest me wat to do
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I don't know if this will help much, but you need to get your hands on a copy of either an iBook system disc or a retail Tiger OS disk. (Disclaimer: Please use legal copies.).
With the disc in the drive, restart the machine and hold down C to boot from the disc. There's an option to reset the admin password when booted from the disc. It may be in a menu (top of screen). Reset the admin password and you'll be all set. If you don't have a Tiger disc, you may be able to get one inexpensively from eBay or wherever.
This brings up something I've noticed helping people with problems, most don't know where their system discs are (or never got them). You'll likely need a system disc eventually. Friendly advice: Keep track of them!
The blue screen marks the start of the login process. If the Mac freezes there, it usually indicates that some third-party System Preference is hanging the boot process. There are several ways to diagnose the problem. The simplest is to hold down the Shift key after hearing the boot chime. This will disable third-party System Preferences and should allow you to come up to the login screen. Then you can review the third-party preferences and go to the website of each of them to make sure you have the most up-to-date version that is compatible with your level of the Mac OS.
Some computer react this way when the logic board goes bad or have a defect in it.
First, Try this:
Remove the battery. Plug back in the power cord, then press and hold down the power button til you hear a loud beep sound. then release it. If the computer starts back up... Then you should be okay.
If not, it may has something to do with the logic board.
Let me know if the above works...
We may can try some other things if not.
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.
Probably the dvd drive is damaged (boot the computer with a bootable cd and see if it works, if not, change the drive), or it might have weak connection in it's slot, remove it and reinsert it in the laptop, see if it works.