Turntable Set-Up HELP!

Hi All,

I replaced an old MC phono cartridge with a new Orotofon 2M Red MM on my VPI HW19jr turntable with an Audioquest PT-8 tonearm. The turntable feeds into a Music Hall PA 1.2 Phono Preamp. Everything was working fine with the MC cartridge, but with the change to the MM I am getting zero sound through the speakers. All other sources are currently working fine. I can hear the needle tracking the music if I put my ear to the turntable, but the signal is getting lost somewhere. I only made two changes to the set-up- added the new cartridge and changed the preamp setting from MC to MM, no other connections to the previously working system were changed.

Here's what I've tried to trouble shoot:
* Checked to see that the cartridge was wired correctly
* Made sure the cartridge wiring connections were tight
* Tried changing the setting on the phono preamp back to MC & back to MM setting
* Removed and reinstalled the needle from the cartridge
* Contacted the store that sold me the cartridge, they suggested it was probably the preamp
* Contacted the preamp manufacturer, they have never heard of this problem before

I do not have another turntable, another preamp or the old MC cartridge to restore it to its previous state.

Any and all recommendations would be greatly appreciated. 

Ps. I am not an audiophile. The system itself was originally set-up Magnolia AV.

Thanks in advance!