I got the chance to get an old All-In-One G3 PowerMac today. I wanted to play around with it and see what I've been missing all these years. Unfortunately, I got it without a keyboard or mouse (with ADB connectors, which I don't have). I wanted to power it on to test if it works or if it's a doorstop. So far, doorstop. So here's my question. Is it possible to boot one without anything attached aside from the power cable? If I don't hear anything (no sounds, nothing spins up, I hear a slight sound from the power supply immediately after clicking the On/Off button near the power cord), should I assume that it's dead? Thanks for any advice!