thanks for your reply. did the .plist delete trick before posting but no cure furthermore with the installer.app gone dead as well I think an archive and install should set things straight.
On Macbook 2nd gen with 10.4.11
when trying to use both software update or installer app they do not work.
Through sys pref getting the message : could not load software update preference pane. If I try to start installer app : icon bounce in dock for a few seconds then disappear ...
Just installed one last week and yes no power button supposed to be on all the time so to sync automatically to iTunes.
AFAIK unplugging it is the only way to turn it off wort case scenario it might reset it.
hope it helps