When setting up pluto you choose the screen resolution. I choose what is standard for my monitor which is 1024x768 at 60hz. When the first screen starts i can hear the instructional video playing, but all i have is a white screen with a mouse cursor. I have reinstalled it many times and can only seem to get 640x480 to work. i have also tried to change the resolution after the fact using the webmin system, it does switch to the higher resolution test screen so i know the monitor and video card can do it. Then when you apply it and the MD reloads the screen is white with no icons on it. Many times if you change the resolution in any way you cannot get the buttons back at all it just stays a white screen.
The system is a fresh install. The system is setup as a pluto hybrid with dhcp server off.
Dell Optiplex GX260
Nvidia MX4000 128Mb agp8x
Sounds like a video card problem... if you have onboard graphics take your agp card out and reinstall. Alternatively if you have access to another graphics card (nVidia or ATi) try that... but again reinstall.
Best of luck.