Thanks to many of your suggestions, I had several things to try. When I went
into the system BIOS, I noticed (to my surprise) that the "Rapid Resume"
feature specific to IBM Aptiva's was already disabled. Hmmm.  So I disable the
APM (Advanced Power Management). The immediate effect of disabling the APM was
that the computer no longer turned off when using the Win95 shutdown routine;
it stopped at the more traditional "It is now safe to turn off your computer".

The problem has not recurred.  I guess that disabling APM on *this* computer
disabled the soft power off feature, and now it really does power down.

I will probably never know what occurred that made this computer start turning
itself on, when it never had, but it is no longer occurring.  I suspect that
the several suggestions regarding ringing phones, or middle-of-the-nght voltage
changes is the answer...but the client is happy enough that it has stopped.

Roxanne Pierce
R2 Systems, San Diego
mailto:[log in to unmask]

On Tuesday, February 24, 1998 23:20, Roxanne Pierce
[SMTP:[log in to unmask]] wrote:
> I have a client with an IBM Aptiva, using Win95B (Pentium 166, 32MB RAM). It
> uses a "soft" power down...<snip> About one week ago, the computer started
> turning itself back on again in the middle of the night. I know the power
supply
> is still "live" because of the soft power down feature, but I cannot
understand
> what would make the computer power up again.