IMac starts up by itself

my Intel iMac starts up by itself for no apparent reason after it was shut down
using the shut-down command in the Apply drop-down menu. When I come
back some time later I find it is running and I shut it down again - only to find it running again when I return to the room the next time. This does not happen
when I shut it down using the power button on the back.
I have already done a SMC reset and have thrown out some plist preference
lists (as Apple recommended) It has made no difference.
It would be quite simple to always use the power button to shut it down - but
then I find that Elgatos EyeTV will not start the computor when a program is
scheduled for recording. Yes I have checked the Energy Saver to make sure it
is not set for automatic turn-on.
Yes I have also checked EyeTV to make sure that nothing is scheduled for
recording.
I am just over the 90day free Apple phone support and they now want payment for further help.
Looking for some good suggestions,
Walter
iMac (Intel core duo)   Mac OS X (10.4.9)  
iMac (Intel core duo)   Mac OS X (10.4.9)  
iMac (Intel core duo)   Mac OS X (10.4.9)  

Hi Denis and everyone else,
on Saturday I completely de-installed the EyeTV software and pulled all cables out after shutting the iMac down with the Apple pull-down shut-down comand.
It made no difference, the iMac turned itself back on.
On Sunday I followed your suggestion Denis and looked at the Energy Saver.
The "RESTART AUTOMATICALLY AFTER ...." was always unchecked. The
"ALLOW POWER BUTTON TO SLEEP . . . " function was checked and I unchecked it.
From then on the iMac no longer turned itself on (using the shut-down comand) - except when a program was scheduled to be recorded in EyeTV
the computer is still turned on at other times before the scheduled time.
This Monday morning I followed iMac973s suggestion and deleted the Wakein
file also, only to find that EyeTV was no longer able to start the iMac to record
a scheduled program - it missed the start time and I started the computer myself. EyeTV refused to open, it asked for the admin/authorization to install
something - which was the Wakein file . This file is back where it was before
and I believe EyeTV can't operate without it (maybe iMac973 can confirm this)
(Wakein file is an exe file. I always thought that such exe files only exist in Windows Oper/systems.)
To summarize,
a part solution for me is to have the Energy Saver set as you suggested Denis
and then the iMac won't turn itself on any more. The task of recording TV programs would have to given back to the old video recorder which means that taped programs have to be watched on an old CRT televion set (no fun).
I am more happy today but still confused,
best regards
Walter
Message was edited by: Walter Haenel

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