Cubase not picking up signals

My cubase is the only program no picking up any signals from my mpc when I would like record?

Its going in cubase Via My Tascam 122

Do you have the correct device driver and audio inputs configured correctly? If so do you have monitoring on, et cetera?

Well it allways worked fine I had everything installed right.

But is there a reason that Cubase does this?

I have a G4 power book mac if that helps.

Nope, Cubase shouldn't all of a sudden stop working. Being that it was working before, and that everything else is working, I'd check your settings. Which version of Cubase are you using and have you changed anything in your setup recently (drivers, template settings, update Cubase software, dongles, etc)? It's probably just faulty settings, though.