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Mac shuts down automatically for no reason

Hi, my Mac desktop just shuts down for no reason after about 5 minutes idle. It started doing it about a month ago. I've never installed anything new since I bought it.

specs:
OS X version 10.3.9 (7W98)
1.8 GHx
PowerPC G5 (3.0)
768 MB DDR SDRAM
1 CPU
L2 Cache 512K
600 MHz bus
Boot ROM version 5.2.2f2
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masterorb
Asked:
masterorb
1 Solution
 
jhyieslaCommented:
Is it possible that you have an external power problem like a bad surge strip or something similar?
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jhyieslaCommented:
You may also want to reset the SMU:

http://support.apple.com/kb/HT1767
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masterorbAuthor Commented:
I'll direct connect to the wall for the first suggestion and investigate the second, thanks!
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strungCommented:
Check the energy saver prefs.
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masterorbAuthor Commented:
When you do that, is the Mac supposed to give off an angry beep, and then the power button supposed to flash?

I did it, then shut down and restarted. Same problem. My Mac is now directly plugged into the wall, too.
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jhyieslaCommented:
When you do which one?
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jhyieslaCommented:
I wouldn't  think so, but I don't have a G5 here to test.  I have reset the SMU on a newer imac and didn't have that issue, but the procedure is a little different.
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jhyieslaCommented:
If you have a powerMac G5 instead of an imac G5. Try this.  Turn off the mac.  Pull all cables including the power for 2 minutes.  Then plug all cables back in and then power on the mac.  Note that this is a slightly different set of instructions that for an iMac G5.
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jhyieslaCommented:
I'm including the apple document as well in case you have a later version powermac G5.

http://support.apple.com/kb/HT1436
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dalesitCommented:
Check the system log - it might be a temperature issue or the bad capacitor problem that affected some G5 imacs. If it is a temperature issue, this might be recorded in /var/log/system.log - it will also give details about what is happening if it is deciding to shut down.

Cheers,

Joel
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masterorbAuthor Commented:
jhyiesla

"When you do which one?"

When I do this: http://support.apple.com/kb/HT1767  (it makes the angry beep)

I'll check all other suggestions later this week.
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masterorbAuthor Commented:
I'm really not sure how this worked, because at first, I had the exact same problem. But about three days later, the Mac started acting appropriately again!
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