I'm sorry to crash the party. I am really over some people claiming that nothing can be done to help the K40. I have had mine for over 3 years now. Yes, I did upgrade with a DSP controller kit from Lightobject.com. The total cost of my laser, with the upgrade, was about $1,100.00. No other machine with a DSP can match that price. The machine can be a good hobby level unit with the right upgrades. Mine is still running with the original laser tube. Again, over 3 years. I have read many posts on this forum in the past 10 years that relate to problems with the "better" units having problems and the owners not able to get help from the vendors. It is all part of the game. None of the overseas units are without some problems and I am sure the some state side sellers are just selling revamped cheap Chinese lasers. Just read the forums, they almost all have problems with little to no customer service.

Milt