I believe I have the same problem with a Mid 2010 21.5-inch iMac (serial ends in DAS). Trying to boot from a Mint 10 Live DVD, screen goes black early in the boot process. If I put 'nomodeset' or 'radeon.modeset=0' on the boot line I see text until after the "welcome to Linux Mint" message, command line prompt appears, then after some delay it goes to black screen again. If I put 'text' on the boot line I can boot into text mode and text display remains visible. I do not have an external display readily available to check if output is switching there.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/597070 Title: Imac Radeon HD 4850 switch "Mini Display Port" output during install resulting black screen -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
