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The system is a PowerPC Mac Mini running MacOS Tiger 10.4.11.

When I login (I'm the admin), everything seems fine - until about 10-15 minutes later. Then the system goes into sleep mode. Each time I try to wake the system up - I can barely log in before it goes to sleep again. Sometimes I don't have enough time to enter my password (from the screen saver).

If I shut down and restart, then I have that 10-15 mins again - until it again goes to sleep.

I checked the settings in the Displays and Energy System Prefs. I looked at Accounts and at Screen Saver System Prefs; no times seemed to be present. I've already reset the PROM and other things (as part of an earlier problem shooting session).

If I don't log in at the desktop, things seem to be fine. Nothing in .profile, /etc/profile, or /etc/bashrc seems to stand out.

Right now, the system is hardly usable; can someone help? Many thanks...

EDIT: Thanks for the migration. I only just found out about superuser.com; fantastic!

PS. I should mention that the sleep occurs even if Caffeine is toggled to "no sleep", and even if Jiggler is running (both programs set to keep the system from sleeping...)

Mei
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Do you happen to be using an aftermarket keyboard with a sleep shortcut key on it? I had a wireless one that was busted and would randomly sleep the computer when I typed the letter "p"

MDMarra
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These symptoms sound like System Management Controller corruption.

Follow these instructions to reset it.

Oh, never mind, i missed your specs. PowerPC eh?

Well I'll leave this answer here in case Intel mac owners find a similar problem. :)

In your case, you need to Reset the PMU. You said you reset the PROM. (Did you mean PRAM?) This procedure also does that, I don't know if you've tried it.

Instructions here.

ghoppe
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