Broken Monitor

I recently purchased an iiyama Prolite GB2773HS monitor. I've attached it to my PC with a DVI cable, and I am using a GeForce 660 Ti graphics card with Win 8. Once I get to selecting its refresh rate, if I select anything above 60Hz, the monitor goes blank, occasionally flashing individual green and distorted frames. I've left it for a long time and switched the DVI cable and tried a 1.4a HDMI, but to no avail.
Any help would be much appreciated!

Bodge :)