Sound Levels and Headphones During Recording

I have a Xenyx mixer that I use to record with my Cubase 5. I recently moved and my settings were disturbed in the process. I completed the setup and the record and playback is fine, except that during recording, no matter how high I push up the Main Mix controls, the sound level indicator does not light up. No sound also comes from the headphones jack. I can heard sound from the headphones jack if I use the sub 1-2 levers, but not the Main. The idea is to hear the mix as its coming out of the mixer through the headphones. It will also be nice to see the sound levels rise as the levers go up so you know when it’s clipping. I must have pressed or un-pressed one button. Anyone really familiar with this mixer? Thanks.