I just got my s1 in and tried to do a simple project but the machine goes through the whole process and light comes on and it acts like it's engraving but on the wood there is no engraving.  I am using the wood that came with the s1 so I used the 3mm plywood setting.  I also tried to do it using my own setting of turning up the power to 85 and still no engraving.  What am I doing wrong?  Please help