PM 6100/66 W/DOS Green screen problem 7.5.5

I have a Power Mac 6100/66 w/DOS card and a 15" Multiple Scan.  7.5.5
A few months ago, my monitor switched from the regular colors to a
"greenish" off color screen.  (While trying to play w/ the system, I disconnected
the DOS card from the monitor cable and just worked with the Mac.)  I
talked w/Apple for awhile.  They had me reset the Parameter RAM, resink
the monitor, and hit the reset button on the monitor.  Nothing worked.
They finally gave me a new monitor.

I hooked up the new monitor, and restarted.  It started up green.  (Curses
and expletives, lots of 'em)  Upon reaching the desktop, however, the
monitor flashed to the right color set and stayed on the right colors.  For good.  I was
happy.

Soon after, I decided to reconnect the monitor to the DOS card.  I
reconnected the cable and turned on the computer.  Immediately, the
monitor showed the green screen in both environments.  No matter what I
have done since, including disconnecting the DOS card, has reset the colors to correct.  No go.  I have not
seen the correct colors on my screen since then.
Except once.  I was playing w/ the PC Setup Control Panel, and the monitor choice
was set to Apple 16.  I then changed it to VGA, on a whim.  I switched to
PC environment--and lo and behold I had good colors.  I switched back to
the MAc and had good colors.  Much rejoicing.  I worked with both
environments for awhile.  Everything was fine.  Until...

Next time I restarted the computer, I had a green screen (still on VGA
setting) and nothing I have done since has seen a good screen.

HELP!

Daniel

Daniel.C.Montiel.1@nd.edu
VisionQAsked:
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tekmoCommented:
I have seen the same green screen problem as the result of a shorted cable or a poor connection.
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