About 2 weeks ago I got the black screen and no chime. So I went to my local apple store and got a Logic Board replacement put in, no problem. Now it's about 2 weeks later and my G5 seems to be squeaking. I think the sound is coming from the 1 of the 2 back fans. Should I take it back to the Mac Genius again? The sound is pretty darn annoying, but loud music or headphones does the trick for now. Also, the squeaking does not happen all the time, just most of the time, another fun thing to explain to the Mac Genius.