What is the actual model of the monitor, though? Also, to find out the graphics card just go to My Computer > System Properties > Hardware (tab) > Device Manager, and it should be under Display Adapters.

Also under Display Properties (you can right click on the desktop to access this), make sure that the refresh rate is set appropriately. I think it depends on your monitor, but if it's an LCD it should be alright to set it to 60Hz. You may have to check under the Advanced tab.