Sega master system troubleshooting

[Elerach]

I recently bought a sega master system which has been working great up until today. I noticed when i tried to boot it up today that every single cartridge i put into the console causes the master system "software error" message pop up on the screen. Cards still work fine, so my conclusion is that the cartridge port must have been broken somehow. Does anyone have any suggestions on how to fix this?

 

I would really like to get this master system up and running as soon as possible.

 

thanks, elerach