Hello I have an issue with laser I’m new and I need help it make strange noise if there is someone who understand i did everything for the installation but can’t do it myself maybe so please help 
Here is a full set of guides for Sculpfun lasers:
Everything you should need to know is included there. The fan is very noise and can’t be turned off, if you are talking about this. If you have the head crashing into the frame, then it’s a positioning issue.
When I turn on air machine don’t engrave
Because you didn’t configure it correctly. Go through the guides I linked. Especially this one: Setting up the software - Diode Laser Wiki