Hello. I'm trying to fix my brother's powermac g4 500. I purchased a new logic board for it and installed it. These are the problems i'm having so far: 1) I have to zap the pram before every boot or it won't boot. I have a brand new battery. 2) I've installed 9.2.2 on it (per my brother's request) and everytime I boot it up it tells me "the built-in memory test has detected a problem". Allows me to say ok and continue booting. Any idea's would be so helpful. Thanks!