GeForce 560ti low resolution problem

[mazdamer]

Hello everybody!
for the first time I installed Mac OS X Lion 10.7.2 on my PC. The system works very well. My graphics card has been correctly identified as the GeForce 1024mb 560ti. But resolution is only 1024/768 (I have 24 inch monitor ...). Can anyone help me solve this problem?
My hardware:
ASRock P67 PRO 3
Intel Core I7 2600k
Kingston HyperX 16GB DDR3 1333 (4x4)
Gigabyte GeForce 560 1GB ti
HD WD 640GB SATA II

Thank you and best regards,

Mazdamer

 

[karacho]

Try this and reboot