When out on a work job to deliver some new ThinkPads today someone passed us an old PowerBook 100 they found in a cupboard for disposal. Me being an inquisitive bloke tried to fire it up but I'm not getting very far. It flickered into life when on the mains for a couple of seconds then goes dead again. Left it powered for a couple of hours to give it the battery a kick then tryed it again. Get a quick chime, followed by the screen powering up for a few seconds with a mouse pointer then it goes off again. Any ideas?