Do you have a command on the monitor to restore to back to factory settings?
Have you tried device manager and updated drivers?Could you also update drivers of the monitor if it requires drivers.
Do you have a NVIDIA control panel installed?Or an ATI control panel?If your graphics card is one of these brands this may mean you need to update drivers and install this control panel from there website.
Here is manual,driver download and troubleshoot:
http://search.hp.com/gwukeng/query.h...utf-8&qt=w2207