You're using dual view?
On the good monitor, right click desktop > screen resolution
Select the monitor that says "out of range". Lower the screen resoluation to the minimum, then slowly take it back up until it does it again, then you'll know what to set
I am using 3 ASUS 242H monitors that are ,all set to the same resolution and refresh rate. The left one bezels up just fine. The one on right gets close to aliging the lines using the matrox bezel management software and then goes blank with the out of range message. I lower it back down a couple numbers and it comes back on but still cannot get it line up like the on eon the left does.
I wil ltry switching cables around also and see what happens. Just thought some one might have had this problem.