I bought a monitor a while back, and it is out of warranty now. It will have power to it, but the screen won't come on. Also, when it does work, anytime I change resolutions, the screen will not change with it. It will be either too large or small and not fit the screen properly. I was thinking that it could potentially be the bulb has gone out, but the fact it won't change resolutions when it does work baffles me. Any help would be appreciated.