Over the past few days, my computer's been acting pretty slow in terms of gaming, even to the point where it froze up three times in a single day! The next morning, I disconnected the PC tower and cleaned out all the dust that was inside it. But when I plugged the cable into the graphics card, (the VGA slot, I believe), the monitor got no signal. I had to plug it into a different slot in order to get the signal going, at the cost of being able to play my games. I ended up talking to a lady on Nvidia tech support and she said that the BIOS setting was reset when I unplugged everything, which is why the monitor gets no signal when it's connected to the graphics card. How do I change the BIOS settings to detect my graphics card AND get signals to my monitor?