Hey everyone, So I just changed out the hack-job white LED lighting system in my G5 to similar LED lights that change colors. Right after doing this, I noticed that the fan, which sits in front of the mid-section of the G5 (behind the frontal grill of the computer, right underneath the optical drive) spins much faster than before... IDK if it's some strange coincidence, but it would always run at a much lower speed. (still spins fast while idle now). Anyway, to be safe, I still want to do a fan calibration. I know that you have to have Apple's diagnostic disc to boot from, then you select the calibration test. Question: Is it necessary to do this test if I haven't done anything like reseated the CPUs? I just want to make sure my fans aren't running faster or slower than they need to be. Also, WHERE do I obtain this disc or disc image? Is there a free download somewhere for this hardware diagnostic disc? -Thanks (gosh, this frontal fan is bugging me...) EDIT: I did the calibration test (even though it said it was not necessary) and I guess it really WASN'T necessary. Yet, this fan is still running so much faster! It's really annoying me.