hi, everyone!
i have a problem with my sega genesis...well, last week i bought a SONIC 1 cartrigde (the guy told me that the cartridgee is tested and working), so when i happily put it in my console...surprise, it doesn't work...black screen (not even PRODUCED BY OR UNDER LICENSE blah blah blah)
i tried to clean the cartridge contacts with rubbing alcohol, with no results...did the same in the cartridge slot, no results...
i think something is wrong with the cartridge's circuitry, since my SONIC 2 works fine in the console

could it be that i use a generic power supply to power my genesis?
could it be that a condenser or resister in the cartridge is faulty?

any help or tip will be appreciated =)

video of the problem: http://www.youtube.com/watch?v=etCKp9X9ewU