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Helpful answers
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Jan 29, 2012 4:42 AM in response to KFeickertby Carolyn Samit,Several ideas...
If you haven't done so, try Starting up in Safe Mode
Once you see the Desktop go to the Apple menu > Restart
Safe Mode deletes some system caches that may help.
Since you are running v10.5 you could do an archive and install > Installing Mac OS X 10.5 Leopard
That places a new System Folder on the drive without having to do a complete erase and reinstall.
Good that you backup your data !
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Jan 29, 2012 6:27 AM in response to KFeickertby Cattus Thraex,There are two basic directions to investigate: software or hardware. I would say your disk is dying, but may be incorrect. The simplest way to test is to install a valid Mac OS system, any supported by your mac, unto an external disk or 16 GB flash drive, sufficient for a minimal system. If it behaves OK, it means either your system is bad or your disk is dying.
You may of course put a new disk inside, install Mac OS and it will probalby work. Existing disk, if really good, may be further used as an external disk. I have 3-4 such external disks as a result of disk upgrades across years.