Mofimadness is right, if you haven't used it in quite a while the cartridge's suspension may have dried out. This happened to a ZYX cartridge that I owned for a few years, and I don't know that you can do anything about that.
However, I would also follow the rest of his advice, check the tubes in your phono stage, clean the stylus and make sure it is still there, re-check all alignment guidelines, and lubricate your turntables bearing and motor. Make sure everything is still properly grounded too. Good luck.
However, I would also follow the rest of his advice, check the tubes in your phono stage, clean the stylus and make sure it is still there, re-check all alignment guidelines, and lubricate your turntables bearing and motor. Make sure everything is still properly grounded too. Good luck.