new install of 12.04 on an old dell with a radeon ATI RV516 video card with monitor out and s-video out.
During boot up all is good. Both screens operate and look fine. Then just before the desktop appears, the CRT goes purple and is converted into heavy horizontal lines, but as i said during boot up it was fine and the resolution was fine. The main monitor, an lcd, operates normally.
everything else works fine, it's just the picture on the CRT that is screwed up.
I used the same monitor and CRT running 11.10 which worked fine
any help would be appreciated and yes i am a newbie to ubuntu here is a vid showing the completely normal screens at reboot then the purple badness when the desktop loads ?? and don't laugh at the slow machine, it's old. http://www.youtube.com/my_videos_edit?ns=1&video_id=zfuh6lBMLnc
CRT is a Toshiba 32MW7DB, s-video is a direct input. My xrandr data has no data in the second column for the s-video (apologies for not knowing how to present the data as it appears in the terminal window)
DVI-0 disconnected (normal left inverted right x axis y axis)
S-video connected 1024x768+1680+282 (normal left inverted right x axis y axis) 0mm x 0mm
DVI-1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 473mm x 296mm 1680x1050 59.9*+ 1280x1024 75.0 60.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0