Reboot after Power loss doesn't work

The situation:
I bought a APC Back-UPS 350 and a mac mini for an exhibition.
The Power ist turned off by the stuff from time to time.
The UPS turns off the mac after 1 minute (10.4.7 works fine, 10.4.10 doesn't react at all but
thats not the problem)
The problem:
the mac doesn't restart after turning the power back on. I checked the "Power loss restart"-option
in the panel. I cleared the PRAM, did a reset on the SMC, … has anyone an idea or better: a solution? Thanks.

Hi happyappleusersofar-
Greetings and welcome to the Apple boards.
Any chance the UPS is not putting out any power for some reason? Have you tried this with the mini plugged directly into the wall?
Luck-
-DaddyPaycheck

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    69        Mon May 16 13:19:36 2011        AP Disassociated. Base Radio MAC:00:1d:71:e1:b2:20
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    71        Mon May 16 13:19:36 2011        AP's Interface:0(802.11b) Operation State Down: Base Radio MAC:00:1d:71:e1:b2:20 Cause=Heartbeat Timeout
    Greetings Lydia

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