Power-up and Going to Sleep Mystery

I have a G5 iMac which has the following symptoms:
1. It takes from 5 to 6 minutes to start up. It goes through all the normal processes --chime, apple on grey background, blue screen, etc.
2. When I force-sleep, the G5 fan goes into "cyclone" mode and I have to force the power off.
My G5 is operating 10.5.8 and everything seems to work - network, internet, email, Office, etc.
Any ideas?
-Bob

For (1), try resetting PRAM.
http://support.apple.com/kb/HT1379
When it gets back to the Desktop, run System Preferences +Startup Disk+ pane. Make sure your internal drive is selected (highlighted) as the startup disk.
For (2), try using the reset SMU procedure.
http://support.apple.com/kb/HT1767
You can also use +Repair Disk Permissions+ in Disk Utility as general maintenance, if it you have not done so recently.

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Intel imac 24" seems to overheat top LH corner and goes to sleep

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The iMac is very hot in the top left hand corner so I assume that there is a thermal safety cut-out that is putting it to sleep ?
Tapping the keyboard a few seconds later staarts it up again but very soon heating issue causes it to go to sleep again.
I've never opended it up so I don't know what componenet is sitting in the top LH corner that is getting very hot - suspect its the graphics card.
anyone else had the same issue and know how it can be resolved ?
tia,
Max

Your machine is working kind of hard, the first thing I'd try is doing both a SMC and PRAM resets, in fact doing 2 of each wouldn't hurt.
With only 493MB of free RAM you should upgrade. One thing you can check when you do this is to see if there is any dust that has accumulated on the intake port, this could be obstruction air flow. Do NOT blow are in but you can vacuum it out. I would recommend using www.macsales.com (OWC) and Crucial as vendors. I prefer OWC because they specialize in Macs so you know what they sell works, have terrific customer service and competitive pricing. BTW OWC has how-to videos that show how to install RAM.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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Refer to your router manual for instructions on changing your wifi channel or adjusting your multicast rate.
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I assume you have checked your sleep settings in System Preferences>Energy saver
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It could be the battery - have your tried it just on mains? If it's a pre unibody MacBook try it without the battery at all. This could happen if you have a non-Apple (cheap Chinese) replacement battery.
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Try booting from the install media and repairing or reinstalling OS X. (Back up first!)
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Hello,
Have you blown the dust out lately?
Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
If you have any temps in the 70°C/160°F range, that's likely it.
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
How to reset the SMU/PMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
http://support.apple.com/kb/HT1436

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Hi Imyakaty,
Welcome to Apple Discussions
You might want to look at...
Knowledge Base Document #86284 about Calibrating your computer's battery for best performance
Knowledge Base Document #500666 has Tips for maximizing your PowerBook and iBook battery charge
Lithium-ion Batteries
About Notebook Batteries
Knowledge Base Document #14449, which covers Resetting Powerbook and iBook Power Management Unit (PMU)
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It successfully resets the SMC as the orange light flashes green for a few seconds before turning orange again.
I've tried the charger with 2 different plugs with and without the extending cord. I've also tried booting on battery power only.
The power button is not broke as it recognizes it while doing the SMC reset.
Thanks so much for all your help, Silas

dwb wrote:
does the little light on the mag safe dongle turn green to indicate it is charging?
Are you sure you mean green? Mine is orange when charging and green when fully charged - always been like this with the 3 macbooks I have owned.

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Regarding your fan issue see Article:
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Wookiemaca

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I apologize for the angst. The problem has cost too much money in lost time and material because when it would automatically shut down after a few minutes, all my work was lost.
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Power-up and Going to Sleep Mystery

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