Google is a wonderful search tool.
Nice to read your thread and glad you have gotten use from your 4th Generation FSE Hobby Laser.
I bought one back in September 2011. It didn't work.
the Motor Control cards (two of them) were faulty and the Retina Engrave card (USB interface cards) (Two of them) were faulty.
It took me near six months of back and forth phone calls and emails before Full Spectrum gave up and sent me a new machine, which did not work.
So their story of the card not working was a bit of a fib, as I had two not work, only months before yours was found to be faulty....
Months of trial and error and replacing parts and the use of an Electronics Engineer friend finally got the second machine running, although slowly and at low power.
In both machines parts arrived in a broken or damaged state, screws were threaded or too short to do their job. The power supply in the second machine was faulty, and was replaced with the one from the first machine.
The help I got at first from FSE was great, until things continued to go wrong and I sought assistance from the CNC Forums (where I post under my name as above), then things turned nasty.
The Retina Engrave software is great in my opinion, but the customer service from FSE Engineering is pitiful, especially from the owner, Dr Henry Liu.
I have since bought a wonderful 1200x900mm bedded 100w RECI laser from Jinan China Nice Cut and it has been nothing but a pleasure to use, straight from the (very, very large box). I wish I had saved myself nearly 12 months of heartache and bought the Chinese machine instead of the FSE heap of junk.
Oh, the FSE 4th Gen. Deluxe Hobby laser is now used as a lovely (and expensive) bed for my cat.....