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Lower the resolution while you have the other monitor hooked up and then re-connect the other monitor to see if that resolves your issue.
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What computer do you have ? Dell Dimension ( Dim 2400 or 3000 or 4700 ) what ? How much ram, what kind of video card ? What operating system do you have on the system. Give use some spec's to help you.
What settings do you have the monitor set at ? My LCD is great for gaming and word projects so it might be something you over looked
Banchetto 101 Case-Less System
eVGA 780i Mobo
eVGA 295 GTX Video
8 Gb Corsair Memory
Thermaltake TRUE Black CPU Cooler
VelociRaptor 10,000 rpm HD
Windows 7 RC 7100