On Nov 16, 2012, at 1:05 PM, faithie999 wrote:

> i have a mac mini G4 running 10.5.8.  yesterday (i thought it was a fluke at 
> the time) and again just now, it locked up while playing streaming audio in 
> firefox 3.6.24.  the mini was completely unresponsive, so i held the power 
> button until it shut down.  then powered back on, got the startup chime, but 
> then a gray screen with no apple.  i tried resetting PRAM, letting it cycle 
> thru three startup chimes, but same result--gray screen but no apple.
> 
> then i decided to try booting into open firmware to see if the machine was 
> completely dead.  this worked, and at the prompt i typed mac-boot and 
> immediately the apple, then gearwheel, appeared, and it rebooted fine.
> 
> as i said above, this just happened again (altho i booted into open firmware 
> without resetting PRAM, so that troubleshooting step had no effect).
> 
> i know this is an ancient version of firefox, and i am now using safari for 
> the streaming audio, but i'm curious why after a forced shutdown the mini 
> wouldn't restart normally, and why issuing the mac-boot command from open 
> firmware made a difference.

It may well be that the real problem is in why it had trouble booting and that 
the streaming lock up was caused by that (it MAY).  For starters run Disk 
Utility / Disk Verify. Check the System Log, for the boot up process, when it 
locked up and for some time before that.

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