Did you try re-installing the drivers for the monitor?
http://www.samsung.com/us/support/d...05020100&disp_nm=245BW&mType=&dType=D&vType=R
http://www.samsung.com/us/support/d...05020100&disp_nm=245BW&mType=&dType=D&vType=R
That woulod do it. Didn't even think about the dual link- my mom's 19"er came with single link as well, but it's only a 1440x900 display. You didnt mention you were using DVI so i didnt think about links.May have found the resolution to this problem... which makes me despise Samsung.
They send single-link DVI cables instead of dual-link DVI cables with all their monitors, thus making their highest possible resolution 1440 x 900 or so... I am rather angry and will be making calls to their management.
Anyone else get caught by this as well?