There could be many reasons why your laser is not firing. The first thing to check is whether the laser tube is lighting up when you running a job. If the laser tube is lighting up, but you are not seeing anything happening on your workspace, there are a handful of other things to check.
1) See if the Laser Tube is Disconnected
Unplug your laser cutter, remove the tube guard, and confirm that your laser tube is plugged in.
2) Check your Laser Tube's Life
Check your hour counter in your touchscreen (tools > about). Your tube should last 800-1200 hours, but can be less with really intense applications. Your laser tube likely needs replaced.
3) Power Supply Issues
If none of the above, your power supply likely needs replaced and will need to be sent in for servicing.
1) Check Material Compatibility
Not all materials are laser compatible. Harder materials like stone, glass, and metal are too strong to be engraved by a 40W laser, so you will not see any marks appear even if the tube is firing.
2) Check Material Settings
It’s possible your material settings are too low in the software. Try turning up your power and heat in small increments (~10) to get a stronger laser output.
3) Check Mirror Alignment
Perform the 4 corner test to ensure that your mirrors are properly aligned. If not, then align your mirrors to improve laser output.
4) Check Tube Life
Check your hour counter in your touchscreen (tools > about). Your tube should last 800-1200 hours, but can be less with really intense applications. Your laser tube likely needs replaced.
5) Check Beam Combiner
Beam combiner could be loose. See if it wiggles when you touch it. If so, snap it back into place and tighten the screws.