Hi, I am new to the creek and to laser engraving just got a laserpro spirit 30W, used. I loaded the software and did a picture of me on a tile it came out great, now i am trying to engrave and cut on some wood thins I have sent the file to the spirit, the laser head moves but does not fire, question is what am i missing out? Need help before spending money.I have cleaned the lens and mirrors, they were a little dirty but clean now. By the way i am Robert my wife is Lisa. The first owner bought it in 2008. Thanks