My Canon 40D locks up when I click the shutter and

My Canon 40D locks up when I click the shutter and the blue printer light next to the menu button is flashing. All the LCDs go blank and all functions stop working . Originally I was using a vertical grip and it still would not come on when I took the batteries out but after I detached the grip the camera did come back on . Now I'm not useing the grip and I still have take out the batteries and re-insert and turn back on camera to make function work again. Everything looks normal but the same thing happens again once I click the shutter. I've tried this on manual and automatic setting but the results are always the same. I have no desire to print anything so I'm not sure how this light even came on. The manual tells how to print but not how to deactivate this feature. I've scrolled thru all the settings on the camera menu but don't see anything related to this. Is this a camera setting or is my camera broken?