i bought a powermac g-5 and it keeps freezing up on me. when i am importing music, i click to hear the next track that is done and it freezes up. is this normal? my pc never did this! i hope the punctuation helps eveyone.!.!.! software is mac os x 10.4.7, 4 x 2.5 ghz powerpc g5, 2gb ddr2 sdram. importing with i tunes. no manual upgrades. got my mac 2 months ago.