Q: My imac freezes on start-up if and when it reaches the grey screen with the Apple logo. After a few seconds the fan kicks in. I've ... My imac freezes on start-up if and when it reaches the grey screen with the Apple logo. After a few seconds the fan kicks in. I've tried 'safe boot' and resetting the SMU and PRAM, but no success. more
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Helpful answers
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Apr 17, 2012 12:57 AM in response to mowallerby Kenichi Watanabe,Just to confirm, your iMac is a "G5" (not Intel), and THIS is the procedure you used to reset the SMU
http://support.apple.com/kb/HT1767
and not the procedure for Intel iMacs.
If you have the iMac connected to an old (or overcrowded) power strip, try connecting it directly to a wall outlet by itself. Make sure no other cables (other than the power cord) are connected.
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Apr 17, 2012 9:02 AM in response to Kenichi Watanabeby mowaller,Thanks for your reply. Yes that was the procedure to set the SMU. What seems to be happening is the the fan kicks in as soon as the screen freezes. I have tried your suggestion for connecting to the wall socket as well.
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Apr 17, 2012 10:12 AM in response to mowallerby Kenichi Watanabe,If you press and hold the Option key during startup, do you get to the Startup Manager screen?
If you insert your Mac OS X installation disc, and start up with the C key held down, are you able to start up from the optical driver and get to the Installer screen?
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Apr 17, 2012 10:18 AM in response to mowallerby mowaller,THanks will try that if I can locate the disk.
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Apr 17, 2012 10:42 AM in response to mowallerby Kenichi Watanabe,Actually, those were TWO separate things to try. One is starting up with Option key held down, to get to Startup Manager. Startup Manager is in ROM, so if that works, the iMac is getting passed its initial hardware startup test.
If you are able to start up from your Mac OS X installation disc, then the iMac is generally working, but the problem might be with your iMac's hard drive (or possibly a problem with the installed system).
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Apr 17, 2012 11:23 AM in response to Kenichi Watanabeby mowaller,Thanks for that. Now the fan kicks in as soona the Blue screen with arrow pointing right and refresh icon appears. The fan is making an abnormally loud noise.
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Apr 17, 2012 12:57 PM in response to mowallerby Kenichi Watanabe,On that Startup Manager screen, if all you see are the arrow and refresh icon, there may be something wrong with your hard drive. You should normally see the system installed on the internal drive as a startup choice, along with any other available system (such as a Mac OS X installation disc in the optical drive).
Not sure about why the fan is being loud. Odd fan behaviors is usually related the SMU.