Sega Saturn laser calibration

[fredthezombie]

Hey guys, I just bought another Sega Saturn because my old one seemed broken beyond repair. When i got back though the laser seemed like it was dying on me, having issues reading and all. So I took a new laser I had bought for the previous Saturn and put it in. I am having no luck turning that orange nub slightly to the left or right no matter what position. Somtimes after very long loading pauses I can get it to play, but sometimes with no music or it doesnt get to the next screen. Or it just grinds away trying to load but just cant. Any suggestions?