Hi everyone, I recently purchased a Dell U2515H monitor. I want to use it with my MacBook Pro 13'' 2012, non-Retina, 2.5GHz. According to the tech specs, this MacBook can drive a single 2560x1600 pixel display (http://www.apple.com/macbook-pro/specs/). However, for me, it fails: I tried two different DisplayPort-cables, one came bundled with the screen. Running the display at 2048*1152 pixels (the second highest resolution) works fine. OS X preselects 60Hz, I can't change that. Any idea? Thanks!