Can't connect' I think

hello, been offline for several month’s. and forgot how to fix easy?, problems, l
like burning something.
like it says my laser is disconnected.
so my question is. how do i get the laser connected again?
ythanks

Typical first place to look is whether the correct COM port is selected. Does Windows go “ding” when the laser is powered up and/or turned on?

Second place is to replace the USB cable with a quality, shielded one with one or more ferrites.

Machine model?
Laptop operating system?