What video bios are you using ?
There is a Video Bios download from the Dell site that says:
"Corrects Yellow Tint Issue"
I'm surprised the Dell techs wouldn't have checked this with you.
If that doesn't resolve it, then it's something more serious....Get Dell out.
SLI has not worked properly in the M1730 since the 185 series
. Can't comment on anything later than 195 series. It's 13 months later and I've given up on nVidia and Linux.