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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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.
If by "lock up" you mean the mouse/keyboard freezes and the machine becomes unresponsive to any input, and you have already replaced the memory with a known good memory, you may have a logic board problem (not necessarily, but quite possible).
First place to start is by running the Apple Hardware Test from the DVD that came with your unit. (The test is specific to each model of Mac, so don't try to run it off someone else's DVDs unless they have the same model you do.) If you no longer have these, an Apple-Certified Macintosh Technician will have a special Apple DVD containing the collected tests for all models of Mac.
Try resetting the PRAM by turning on the iBook then holding option + command + P + R and wait till u hear another chime. If it still freezes, it may indicate an application may be causing it to lock up hold shift after you hear the chime to boot OS X into safe boot.
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.
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