Monitor randomly "Auto Config's"

Odd thing.... sometimes, for no reason at all, my screen either goes blank for a second before coming back, or the monitor says "auto config please wait" (like its just been connected) there seems to be no rhyme or reason for it... sometimes it goes days without doing it, others it does it several times in an hour,

iv got the latest video drivers, check the connections, and the monitor is an Acer Al1980 which is quite an old monitor now i know....

thoughts? obviously its either the Monitor, the cable or the Graphics Card, but i never had this problem on Vista, anyone care to make an intelligent guess on which one?

yeah thats what i thought too, great, looks like ill have to put off buying that shiny new graphics card i had my eye on, thanks for the input UrbWolf