Sounds like power supply. Unless you have installed some incompatible firmware i would say go for power supply On Apr 25, 2010, at 12:19 PM, Simon Stone wrote: > Greetings, > > my dual 1GHz MDD has been displaying some behavior lately which I > suspect is power supply related, but maybe someone can confirm, or > suggest other possible things to look for. I have an Apple Studio > Display (adc) and a second HP monitor connected and am running OS > 10.4.11. Recently, at boot up, as soon as both monitors click on my > breaker on the power bar is tripped shutting down everything. First > I tried disconnecting the HP - same thing; then the SD and it was > ok. I connected the SD while the MDD was on (maybe not the best > thing to do?) and it worked ok. Today it got worse: the computer > with nothing connected will try to start breifly when I press the > power button, and will shut off - if I try again immediately - > nothing. If I unplug from power and plug again - power button lights > up briefly and shuts down. What's happening here, is there anything > I should try? Thanks. > > Simon Stone. > _______________________________________________ > G4 mailing list > G4 at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/g4