Hogan's Alley Arcade game

[Muzik8799]

Hello everyone! I had a question about my system because I'm not getting a picture. I used to be able to play Hogans Alley but the gun wouldn't work. I got Machrider and a Baseball game and different roms and tried to switch out games. After I switched them my screen was all green, then all purple etc. no sound as well. I tried to reseat the chips again and now the screen is black. I can hear the monitor come on but no picture or sound. Any info would be amazing. Also i got this game for free on FreeCycle as well as Mappy, which worked for 2 minutes then made a popping sound and released a quick puff of smoke. Thanks again, Matt