gav: do u have a RTG board?

mem specs and type of cpu please...
anyway u must install rTG master , as it only work in AGA (which u dont have) or in RTG , so
on the cd there is RTG MASTER , install this but i would recomend u using a newer version, hopefully someone can help u with a link.
(on aminet maybe?)
then u need to select 8bit modes in 320x256 or 640x512 (IIRC) ...
hope this helps for now...
anyway grey screen and on rtg normally means u have used to much GFX MEM allready (ie out of mem)..