[iAtkos S3 v2]Monitor Message : Out of Range

[aggouras]

I am triple booting Windows 7, Mac OS X,Ubuntu in my PC. Windows 7 and Ubuntu are working just perfect. But the same does not happen for Mac OS X. Whenever I select it to boot it goes off for a while and it says Out of range. I am sure it's the display's problem because the font and the layout are the same as its menu.I am using an LG M1721A monitor. I also have Grub as the default bootloader.
Any ideas on how this can be fixed?

Thanks.