What kind of DVI Cable to you have? The 921 manual says it's DVI-I, not DVI-D like the 811. I use a dual-link (supports both DVI-I and DVI-D) cable to go from DVI-I on the 921 to DVI-D on the TV and it works great. Most cables I've seen in the stores are single-link only (DVI-D). Try pacificcable.com. Not sure if it will solve your problem, but it's worth a try. Hope it helps.
