Hello, I am having a little problem with my new iMac. I search in google and I don't seem to get an answer...or maybe I just don't know which one I should do... This is what happen. When I turn on my iMac it goes to a white screen, then to a black screen saying "No bootable device -- insert book disk and press any key" I can't press any key at all so I try restarting...same message goes. Before this happen I did do one thing which I don't know if this is the cause of it. I change the trash can icon...how I did that is I went to... Macintosh HD>System>Library>Core Services>Dock>Contents>Resources I just replace the trash can image with the new one, same name as the old. It did change but then this black screen message start happening... I search on google, some people say to hold alt-option key when you are in the white screen and then enter your drive from there. I did that and that is how I get to here to ask you guys...how can I get rid of that black screen? Some people say you have to reinstall Windows 7 under Bootcamp or something...but I dont have Windows 7 in this iMac. I still did try going to Bootcamp and reinstall things but once I click continue, it said "To create a bootable USB drive for Windows 7 or later version installation, select the Windows ISO image, select a destination USB drive, and then click Continue." But I don't have a ISO image... Anyway so that is why I need help, I don't know how I can get rid of the black screen so I don't have to always hold alt-option to get in to my computer. Please help if you know how to fix this. Thank you so much!!!