MBP shuts down after 30 minutes of inactivity

Hello - I've posed this question before and thought it was solved but it has come back. My MBP (circa 2008) with OS 10.6.8 continues to attempt a shut down after about 30 minutes of inactivity. If there is an open app it prevents the shut down but it sure is annoying.
Does anyone have ideas on how to prevent this? (Please note I am talking about a complete shut down - not going to sleep.)
Thanks!

Thanks Carolyn,
I worked my way through the options and then eventually tried the reset. Bummer, no luck. My MBP still tries to shut off after a half hour passes. It's odd that the timing is so consistent, yet there are no settings I can find that would cause this shut down.

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MBP tries to shut down after 30 minutes of inactivity

Hello,
After 30 minutes of inactivity my MBP attempts to shut down. An open app, like Safari, will prevent the shut down process from completing. This has been going on for a year and I have not found any way to prevent it. I have tried resetting PRAM, looked in System preferences, updated OS with every dot release and have not been successful.
Any ideas on possible causes and ways to prevent this are greatly appreciated.
Thanks,
Karl

Hi nachdenki,
I have checked System Preferences/Energy Saver. Please note that my MBP attempts to shut down completely (vs. going into sleep mode.) My sleep settings are for a time period that is shorter than the 30 minutes of inactivity that is associated with the shut-down. Is there a setting in Energy Saver that affects an automatic shut-down that I may have overlooked?
Thanks,
Karl

MacBook OSX 10.5.5 shuts down after 30 minutes of inactivity

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Figured it out myself. MacBook wasn't actually shutting down, but rather logging out. Went to System Prefs,; Security; and unchecked logout after _ minutes of inactivity.

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My computer: imac G3, DV Special Edition, 500Mhz, 384 mb ram, 80 gig hard drive
This is an odd one...like many others before me the computer just died one day. it would not start up, no sounds, just dead. A few minutes later I tried to turn it on and it came on, but 5 minutes later, it died.
This is the strange part. I took the plug from the socket and waited a few minutes, then pluged the computer back up. It came on. But only for a few mintes and again shut off.
This time I left the plug in the socket, waited a few minutes and tried again. Nothing.
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I have noticed that the computer does not keep time properly.
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1. I have pressed the Cuda Button, and yes it did start up, but only for about 5 minutes.
2. I have tried to reinstall the system hardware, but the computer dies before completion.
Should I replace the battery? What else can be done?
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I have the same problem. I don't have good news, though. I have replaced the battery, pressed the reset button, even replaced the power supply board (not the video board -- which is the only thing I have decided I'm not willing to do). My computer usually shuts down after 5 minutes, but will sometimes stay working fine for a couple of hours. I managed to update the firmware and OS to the very latest, but still it dies. Mine will also occasionally flicker and freeze, which can be restarted by holding down the power button.
I would replace the video board, except the people trying that don't have quite the same problem (theirs don't start up at all), and there is no source I've found that would have new boards, so you would get a bad board, or the same problem eventually. Some people point to a transformer on the video board, but again the symtoms are not quite the same (they smell burt electronics or hear a hissing/crackling sound before it dies.
I have just packed mine away and I'm working on a new G5, but I sure hope the old iMac can be fixed so my kids can use it. I just didn't want you to have to go down the same road just to find nothing helped. Good luck, and if you have any new ideas, I would be glad to hear them.

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I work on behalf of HP
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Kevin,
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"
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My MacBook has just started to shut down after 5-10 minutes. The computer still holds a charge, and the battery Percentage says that it's full, so I dont know what's going on.

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MBP shuts down after 30 minutes of inactivity

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