I've been trying to get 10.5.8 installed on my aTV via a Windows machine. Through a combination of TransMac and MacDrive, I've managed to get a drive formatted as HFS+, and got the image onto it. When I plug in the aTV, the screen goes white, a grey Apple logo appears, and a few seconds later, the spinning progress meter appears underneath it. After 20 seconds or so, the aTV reboots and the process repeats itself ad naseum.

Any ideas?