Somebody gave me a computer w/o the monitor (which was an LCD) so I bought a new CRT monitor for it. When I connected the monitor and booted up the pc, a "OUT OF FREQUENCY" message appeared on the monitor and then the monitor closed. Apparently, my video card (Winfast Nvidia 6800 GT) is out of the frequency range of my new monitor. How can I change the settings of the video card if I cant use the monitor?