Problems with the computer going to sleep on startup

The past 2 nights I've been working in Final Cut Pro and after an hour or so of the computer being one, it goes to sleep despite being in use. The first time it happened last night I found it odd but didn't think anything of it. Well, 5 minutes later it went back to sleep. I woke it up and kept working. It went back to sleep a few minutes later. This kept going on for about a half hour before I figured something was wrong and I should shut down. It was a hot night last night so I thought that may have had something to do with it.
Tonight, I started up the computer and went back to work. After about an hour the same thing started happening only tonight it was more frequent. It would go to sleep about every minute. I restarted the computer and this is when it gets bad. It will go through the startup process and just when it is about to go to the desktop, it goes to sleep only I can't wake it up. I can't do anything. My main monitor appears to shut off completely and my secondary monitor goes to sleep. Not even holding down the power button to shut it down works. I have to turn off the power strip it is plugged into to get it to turn off. This happens every time I try to boot up I don't have a Leopard disk handy to try and boot from that since that is at my studio.
I can't seem to find this on the forum. I'm stumped.
here is what I'm using
G4 dual 1.42 ghz
2 GB ram
20" cinema display main monitor
17" apple display other monitor
I think I'm using the latest version of Leopard but I'm not sure when the last time I ran software update was. Same for Final Cut Studio.

Start up in safe boot:
Safe Boot
http://support.apple.com/kb/HT1455
This forces a disk check called fsck -fy it is similar to repair disk on the disk utility. Once it has started up to your log in screen restart normally and see if that helps

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Time Machine crashes whenever the computer goes to sleep or into screen saver mode.

Apologies if there is an obvious answer or post about this. Every time I try to initialize Time Machine, it will begin backing up until the computer goes to sleep or the screen saver kicks in. When I wake the computer up, I get a message that says "The backup was not performed because an error occurred while copying files to the backup disk." The message also tells me that the problem might be temporary and to try Disk Utility to repair the backup disk if the problem persists.
When I run Disk Utility, I am told that the volume cannot be repaired and that it needs to be reformatted. I reformat the disk, try to run Time Machine again, and get the same problem whenever the computer goes to sleep or into screen saver mode. Lather, rinse, repeat.
I managed to get an initial backup only if I turned off the screen saver and the sleep function. However, once I turned them back on, I ran into the same problem when Time Machine tried to update the backup.
I am running OS X v.10.6.8 on an iMac5,1. The backup is a Toshiba 1TB USB external HD. I saw this same problem posted in the Lion forum (and I cribbed the title of this post from there). Nobody has offered a solution yet, but it was a very recent post.
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Hi Guys 'n' Gals! I have a problem with my computer going into 'Display Sleep' mode and it actually goes into full sleep mode. anyone know how to keep my Mac running software and not go into full sleep after I have set it to 'Never go into computer sleep

Hi Guys 'n' Gals!
I have a problem with my computer not going into 'Display Sleep' mode but actually goes into full Computer Sleep mode. Anyone know how to keep my Mac running software and not go into full sleep after I have set it to 'Never' go into 'Computer Sleep' within the 'energy saving' section!
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Reset SMC. http://support.apple.com/kb/HT3964
Choose the appropriate method.

I'm working on my iMac PowerMac8,2 PowerPC G5 (3.1) 2 GHz machine and have been having problems with the computer shutting down unpredictably. After the problem becoming impossible to work with, I shut the machine down. Now a little better, but reoccuring

I'm working with my iMac PPC G5, PowerMac8,2, 2 GHz machine running OS X 10.4.11, and was having a problem for a while with the machine shutting down unexpectedly. There was no clear pattern to when it was shutting down as far as I could tell. For a while, it would also not restart when buttoned on.
I set the machine aside for a while, probably a month or more, and then got it back out after its rustication. It started up and runs significantly better than it had been, but I have noticed it shutting down sometimes now again, though not as frequently as before. Sometimes it runs for a good long time between active work, sleep mode, and active work again. Once in a while it does shut down when no one is working on it (while asleep). But now it always restarts when buttoned on.
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Option 1
Reset your PRAM. Press and hold down the Command Option P R keys while starting your computer. You will hear the startup chime. continue holding down those keys until you hear the startup chime a second time. Release the keys. If the computer restarts, you will need to reset your Date and Time. It might be time to replace your PRAM battery. The G5 iMacs require a 3 volt CR2032 lithium watch/camera battery like below:
http://eshop.macsales.com/item/NewerTech/CR2032/
You can find these batteries at Walmart, Kmart, Target, most local drugstore chains, for between $3-$5, or at Radio Shack for $12-$20.
If you have any G5 iMac model EXCEPT the iSight version, you can probably do the battery install yourself. Watch this video on upgrading your iMac's RAM to show you how to remove the back of your iMac, if you don't already know how:
http://eshop.macsales.com/installvideos/imac_g5_mem_m/
While you have the back off, use a can of compressed air to blow the dust out the vents at the bottom of the iMac, the fans, and anywhere else you can. Also inspect the 28-30 capacitors on the logic board. Look for dark spots, if they look puffy or swollen, or leaks.
Option 2
Reset the SMC by removing all cables (USB, Firewire, Ethernet, Modem, Power cord) from the back of your computer. Let it sit for one minute. Press and hold the power on button on the back of the iMac while plugging in the power cord. Release the power on button. Count to five, the press the power on button again.
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Place your original, came with the iMac when purchased install disk, into the slot on the iMac, press and hold the C key while pressing the power on button on the back of the computer. (If you have upgraded your OS from when you purchased your iMac, example your iMac came with OS 10.3 installed, and you're now using OS 10.5, then use the OS 10.5 Retail Install disk that you had used to upgrade your OS instead of the original, came with the iMac disk.)
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When that is done, quit Disk Utility. From the top Menu bar (I think its under Utilities) select the Start Up Manager, and choose your normal boot volume as the startup disk. Restart the computer. If successful, and you've rebooted from your normal startup disk, eject the install DVD/CD, and you're good to go.
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How long does migration of data/files from iMac to Mac usually take? And does it matter if the computer goes to sleep mode? Will it still transfer data?

???

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Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

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Problems with the computer going to sleep on startup

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