Hi. I'm working with a white intel iMac and want to install a new OS. However, i've run into some nasty hurdles. 1. I can't manage to get the mac to receive keyboard input during startup. I've tested a brand new keyboard on other systems and it works fine, but none of the boot key combinations have any effect (can't even boot as target). The caps lock light won't even come on. 2. This is the reason i need to control the boot with the keyboard: I'm getting a "no bootable device found" message. This is even when a new Snow Leopard disc is in. I've also tried other bootable discs. The internal drive was working two days ago, but seems dead now. I want to run disk utility from a disc and repair the internal disk, but i can't. I wouldn't even be able to with it as a target. 3. The optical drives makes ugly noises, yet it does seem to be spinning the discs and i have had success reading from discs (prior to my unbootable situation). Any thoughts, anyone? Thanks!