nes

So, I've been collection all of the Nintendo competition roms to put on my SNES Classic. The last one that I'm missing is the "Nintendo Campus Challenge 1991" rom. For awhile it used to be purchasable from RetroUSB but, hasn't been available to purchase in awhile. I've spent the past few days...

I've buy a nes a couple of weeks ago and the gyu have tested it front of me and every thing was write but when i've get homed and try super morio bros./ Duck hunt on my plasma tv but when come a new screen, the screen turn darker ( i can always see the game) and the sound run out for 1 or 2...