Wavy LCD monitor at 1280x960 resolution

Hi all,

I have searched all the forums but could not come right with my problem. All ubuntu's have worked fine on my PC for a while now, but recently in both 8.10 and 9.04 my LCD monitor outputs at 1280x960 resolution are wavy and a little jumpy. I am unable to solve the problem. My system just detects my monitor as "unknown".

Please let me know what you need to try and resolve the problem!

Thanks in advance!