Hey, after I boot the mac, it will come up and after running for few minutes, it locks up, freezes, I have run diag, replaced the memory, hdd, format drives and reload software, and still having issue, is the system board bad, or is it the cpu and heatsink, and if they are, are they expensive?
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?
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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:
Try starting up with the shift key down--a safe boot. You will not be able to work with the internet or many externals but this will test functionality. You can run Dish Utility and verify but not fix the disk and repair permissions. Even better would be to startup from a boot CD/DVD and hold down the C or D key. Then you could fix the Disk too.
Next I would save all your necessary files, preferably on an external hard drive.
If the disk is OK, I might remove as half the programs from the Applications, certainly any that are automatically started up. Reboot without the shift key and see if there is a problem. Add half of those back and try again. Half the amount to add or subtract--a binary search. Until you locate the problem program or reach a state you can live with.
Well, there are a variety of reasons that can consequently drag down the
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Some of the start up files have been corrupted or are missing. Start up from the OSX system disc and them run Disc Utilities from the installer toolbar. Check the hard drive for errors. Repair any errors if they are found. If it's not possible for Disc First Aid to repair the hard drive you will need to replace the drive and re-install OSX.
Try shutting the G4 completely down, waiting about 15 seconds, and then booting the Mac with the shift key down. That should clean up a lot, as it gives a safe boot. Then go to disc utilities and repair permissions. That might clean the whole thing up for you. If sounds like it's a Finder problem. If that doesn't work, boot from Disc Warrior or Tech Tools and run a few tests. Good luck!
Generally there are a variety of reasons that can consequently cause the freezing or slow
issues on your Mac. Meanwhile, there are certain ways through
which you can do to fix one by one. However, if you prefer a more
efficient way to resolve, try an all-in-one Mac speed up software as it
can help resolve all issues in just a few clicks. Learn more: