A few weeks ago, I noticed some corruption in the screen of my 27" 2011 iMac. I have Apple Care, so I took it to an Apple Store and they took it in for repairs, completely replacing the screen with a new one. I took the machine in to their store on Monday, and they called me Tuesday morning saying they were done with repairs. I wasn't able to pick it up until Friday, but now my iMac is back with me with a brand new working screen. After this whole procedure (where I left my entire computer in the hands of other people for about 5 days) I'm a little spooked at the possibility that someone may have tapped my computer or taken some files from it. I know it sounds a little silly, but I've read news stories about some guy who fixed people's Macbooks and made it so they would constantly spy on the users with the built-in webcam. I'm also a bit concerned about the fact that for all that time they had access to my hard drive, which contains quite a few sensitive files and password information on it. I guess what I'm asking is... is there anything I can do to make sure nobody took information from my harddrive or in some way or another put at tap on my computer while it was sitting at the Apple Store for 5 days?