[zigzag]

I've got an 800 mhz FP iMac w/ 784 MB RAM, running 10.2.4. It has started to freeze on occasion. When this happens, I hold the power button down for 5 seconds and force it to turn off. I then press the power button to turn it back on. It shows the gray Apple and the spinning cog, but stays there indefinitely. I've waited as long as 10 minutes, but it doesn't finish booting up. I repeat the process - sometimes three times, sometimes as many as ten - until it finally boots up at a normal speed and works fine until the next freeze. Apple diagnosis disk shows all systems OK.

Any ideas?

[AB^2=BCxAC]

It could be the power supply (overheating the processor), or a corrupt OS kernal or app, or a peripheral.

Have you tried zapping the PRAM? If you zap it 3 times after a forced shut down, it might help you restart sooner.

[zigzag]

Thanks. After reading some other threads, I've also decided to download the 10.2.4 combo update and install it over my 10.2.4 update. It appears that this has solved various and sundry problems for a number of people.

[JasonBourne]

Originally posted by zigzag:
I've got an 800 mhz FP iMac w/ 784 MB RAM, running 10.2.4. It has started to freeze on occasion. When this happens, I hold the power button down for 5 seconds and force it to turn off. I then press the power button to turn it back on. It shows the gray Apple and the spinning cog, but stays there indefinitely. I've waited as long as 10 minutes, but it doesn't finish booting up. I repeat the process - sometimes three times, sometimes as many as ten - until it finally boots up at a normal speed and works fine until the next freeze. Apple diagnosis disk shows all systems OK.

Any ideas?

We got the same iMac configuration..... just lift your iMac and put it down slightly but not to hard,by way unplug it first. This thing happen to me and I almost send it for repair since I got applecare. So far it works for me.