I usually run through the following checklist if it gets stuck:
First thing to check and eliminate is Wifi issues.
- Turn off the machine. Turn off the computer. Unplug the router.
- Wait a couple minutes.
- Plug the router back in and let it fully start up.
- Turn on the computer and let it fully start up.
- Turn on the Glowforge and let it complete the startup calibration.
- Then open the app.glowforge.com and check the status for “Ready”.
Second thing to check for is visibility issues.
- Make sure the lid camera lens is clean.
- Make sure the glowforge logo on top of the head is clean and clearly visible.
- Make sure there is no glare on the machine from a sunny window.
Third thing to check is cable connections.
- Check the connection on the white ribbon in the laser arm. Make sure it is fully inserted and the pins are in good shape.
- Check all of the ribbon cable connections in the lid. The connectors need to be fully closed.
@Michael.V has these instructions on what to do to check connections:
- Turn off your unit.
- Open the lid.
- Using both hands, gently roll the laser arm to the front of the unit.
- There are 5 clips pictured below. Check each one to ensure it is closed. The clip should lie flat, and you shouldn’t be able to flip it in any direction.
- If any of the clips are open, ensure the cable is inserted straight into the clip and close the clip.
- If any of the cables are misaligned in the clip, take a photo of the clip and cable and send it to me so I can take a look before you proceed. Do not try to adjust or reseat the cable.
- Close the lid.
Eliminating those causes helps them to narrow down what the problem is. 