My laser is 3 yrs old & was barely marking material. I replaced the tube (it fires great) & there is still no marking of the material when I raster or vector. I aligned the mirrors twice & all seems well there, however the laser still does not mark the material. All else seems to be working correctly; water, air, magnet safety switch, motors & laser firing. However ther are NO MARKS on my material; wood, acrylic or paper. ALL of my test fires for alignment are good, please tell me what I am missing here.