My parents laptop has recently been displaying very strange resolutions. The screens native resolution is 1280x800@60hz (i think).

It looks like the DCC information is not being sent from the monitor (maybe a cable fault) and so the computer thinks the screen is 1024x768@49hz.

Does anyone know how I can force it to its correct resolution? The laptop is a couple of years old so not working having repaired, however if I can manaully set the right resolution for the screen it might be usable.

Any ideas?