I started up my iMac (see sig) this morning as usual, and noticed that my hard drive ("Macintosh HD") did not appear on the desktop, or in Finder windows. I checked Finder preferences to see if the option to show it was checked, and it was. I tried restarting, logging out and back in, and god knows what else to try and solve the problem. However, it still hasnt appeared. Any help? (i know that it works as i was working on an image in photoshop at the time of noticing it, and i had several word documents open)