Specs for the desktop system connected to the monitor: Quad Core Q8400 2.66GHz, 4GB RAM, 1TB HDD, GeForce GTS 250 1TB VRAM, Windows Vista Home Premium.
Monitor specs: HP 2309p
I don't know if it makes any difference, but I've installed a pivot control software that was included with my monitor.
EDIT: Not always after sleep mode, sometimes this happens after inactivity.
Edited by Kyle B, 31 August 2009 - 01:33 AM.