Hi, For the past few days, I've been attempting to install Windows 7 Home Premium 64 Bit on my Mid-2010 21.5" iMac for my little brother using Bootcamp Assistant. After finding out that my iMac won't allow installation from a USB, I tried to do it with the DVD way. I borrowed some blank DVD's (both in the format of DVD-R and DVD+R 4.7GB) from a friend and I burnt so many Windows 7 ISO's to these discs using these software: Windows 7 USB/DVD Tool ImgBurn Disk Utility Burn When I run Bootcamp assistant, I make the partition and when the iMac restarts, it goes to a black screen saying "No bootable device - press any key to continue" and nothing happens after that. I can't press any key or eject the disc, only way yo get pass this is to shut down the iMac. I'm pretty sure we burnt the ISO to the discs correctly, though I'm not sure if we did it correctly using ImgBurn (my friend did it, he clicked Write Image to Disc and burnt it at the slowest possible speed). I thought the built-in SuperDrive had problems because whenever I inserted a disc, it would eject it after like 20-30 seconds and even if it didn't, Bootcamp would say something like "The installer disc was not found". I bought an external USB optical drive and it actually solves the "The installer disc could not be found" problem. But I still get the no bootable device error so it's something to do with the discs. I tried to boot from the DVD by holding Option/Alt and selecting the DVD but same error occurs. Sorry for the long read, I just wanted to be thorough and clear as possible because I'm really frustrated at the moment. Had to purchase another set of blank DVD-R's because I ran out. Any help would be appreciated, thanks a lot!