Thanks for the replies. I thought it might be dust. I'm a little wary of opening it up though. I've opened a few of my electronics to clean them from time to time, and I know how to do some basic stuff with my PC, like swap out parts from the tower, but I'm no expert, and I've been reading that the old Macs can be dangerous because their CRTs and power suplies can actually hold enough of a charge to kill or serious hurt. I know there are ways to discharge it, but I may not be quallified to mess with something like that.

Also would a compressed air can be okay on these older systems? Or would they be too harsh or something?