Screen resolution

Anybody know how to change the screen resolution of
the CMA monitor
I have a 15" KVM type 1U monitor
and the Axon is giving out 1280 x 1024 @ 59.9 hz
That is a 17" res
I'm looking to change it to 1024 x 768 @ 75 hz
Is this changeable in the Bios ?

regs
K