Some background info first-- PowerBook G4 1.67ghz, 1.5 gigs ram. I installed Leopard around October, I think. A few months ago Apple replaced my logic board. When they gave it back to me, they said my 1 gig Crucial chip was bad, but I reinstalled it and my laptop works just fine. Recently when I power on or reboot, they grey screen shows up, and eventually I get a pinwheel for about a minute. Then OS X opens like usual. I never used to get the pinwheel until about a month ago. Now it just seems like the pinwheel stays longer and longer. Seems like it booted faster with 1 gig ram before the logic board replacement. Any ideas?