PS3 Monitor 720 screen problem

Hi,

I pressed teh damn 'Auto' burtton on my 'Deluim 22"' monitor and it mesesed my 720p mode up for the ps3. Made it so the screen is too far to the right. I had this before but I forgot how I holved it. =( pal / 520 work fine, jus not 720 :(. If anyone has any lideas?

Cheers