My iMac does not display anything on screen but the backlight is going. I would like to determine if the GPU Fx5200 is functioning from the open firmware. I think the basic POST test is successful. The GPU appears in the "dev / ls" list etc. I would like to know what commands/words can be run to exercise the display to show some basic operation. I have the machine setup with input & output, to & from enet:telnet,IP_addr thru' the network adapter to another PC. Are there any externally loaded and executable utilities that can be run from open firmware other than boot loaders ? Can you get the console CLI running through a telnet connection ? Is it possible to flash the open firmware support code for the GPU ? When I try to boot from OSX disk it appears to be performing a HD test and comes to a stop (CAPS button/light works). Sorry there are a lot of questions, but I am finding it difficult to find this info anywhere else. Thanks for reading.. Brett.