My iMac has a problem. No USB devices are working AT ALL. And apparently, the bluetooth receiver is connected to the internal USB hub, and the hub is loose on the inside and is not working (according to AppleCare.) This leaves my Mac unusable because I cannot use any keyboard or mouse. This happened on Monday. I made a genius bar appointment and the earliest they had for my THREE CLOSEST STORES was today. But now I have the flu and can't make the appointment today. (I'm not complaining about being sick, but if Apple had at least one appointment on the day it broke, I would have a working computer today.) Now, the next appointment available is SATURDAY. So now I have a 24" brick in my room until Apple has the time to fix it. I don't understand how sometimes when I walk into the store, the genius bar is completely empty. Does anybody else have this problem in their area?