Please help me fix my master system!!!

hello

can anyone please help me fix my sega master system. i just bought it but it came with out no leads but i used the leads from my nans master system 2 but i couldnt get a good picture.all i got waz the sega master system logo on a fuzzy screen and the picture was going all over the place then the game will load but the picture will eventually fade away. i was reading in other forums that you have to have a certain power plug i am using a master system two one is this right? does any one now how to fix my sega problem thank you!!!!
 
I had a master system once where the problem was just a loose channel 3/4 switch. The picture would show up funny, but if you just jiggled the channel 3/4 switch, the picture would clear right up.
 
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