So i have a 30001 v4 that originally had a 400B laser and i bought a 400C one. Put it in, connected the ribbon cable and everything. I turn it on, the laser moves down the tracks and tries to focus but there's no light coming from it. The disc spins about a quarter then stops. This is the same thing that happened with the original laser which is why i bought a new one. Anyone know what's wrong?