APPLE MAC POWER BOOK G4 (SPARES & REPAIRS) .

Bought this Mac off a boot sale awhile ago, was going to put a new operating system on it and start a new project but never did, still has the same operating system on it from the previous owner. Reason im selling it for spares & repairs is because sometimes it turns on and others it doesnt, but when it does come on it works fine, just has an issue at times when it comes to turning it on, my friend believes its the power switch but neither of us have a clue where to begin, i purchased a new battery thinking it may be that but still the same story, as i say when it does decide to play ball it works fine with no problems. 1GB RAM 1.67 Ghz Not sure of hard drive size Charger 2 x batteries Sold as spairs & repairs with no returns..