How to fix resolution for one monitor

[Krsnendu dasa]

All my clients are the same.
Most have 15"" lcd monitors. One has a 17" LCD monitor (Brand: Direction
Model:L-171)
All 15" monitors default to the correct 1024x768 resolution. The 17" monitor
shows 600x800 and I can't figure out how to change it.
All the monitors worked fine with K12LTSP 6 only now with LTSP 5 it is
having a problem.
Any tips?
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