I've yet to see a Mac do these things in this particular order before. It may just be coincidence? I have a Mac Pro that I've been working on for a friend. Long story short, I decided to perform a clean erase and install of 10.6, as they have been having severe permission issues lately, and often a clean install with a new user that you then move the files into will correct permissions. After imaging the Mac Pro drive contents to an external, I erased the Mac Pro Drive and set an erase and install of Snow Leopard. When I came back, the screen was black, and both LEDS were on, but the monitor (Apple Cinema Display) would not wake from sleep. In fact, it seemed like the machine was off. When I push the power button, I get one LONG beep before POST, still no video, and eventually, I can hear the music for setup assistant playing after a minute. I couldn't eject the 10.6 disk either; I had to unplug the USB chain from the cinema display and plug the keyboard in directly to the front in order to force eject on next startup. Prior to this I had never heard the machine beep before POST, and the display always showed video. I switched DVI ports, have reseated the RAM and reset PRAM. I'm not sure where else to go here? One long beep and the front LED flashing once (typically) indicates no RAM installed/found. I've seen Mac's fail during 10.5/10.6 install due to RAM issues, but you normally get a error message mid-install with a prompt to restart the machine/contact support. TL;DR? I get one LONG beep before POST chime during start up, after just having done a clean erase and install of 10.6. Any suggestions/thoughts greatly appreciated. Thanks.