My PC boots up then the screen goes blank!!!?

I downloaded a free version of Family Feud on my dell desktop computer and when it finished downloading it went into a full screen mode and I could here the audio but the monitor went blank. Nothing worked everything was frozen except the audio. I turned off the power holding the power button and rebooted. It showed the Windows logo and everything when it booted up but then it just went blank again. I've tried rebooting multiple times. What do I do!?!?!?