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Hi Colleges

I recently bought a Sunhokey machine 2015 version. I assemble everything according to the instructions included in the DVD, calibrate everything, and print a lot of the projects for the machine that I found on thingiverse using the SD card.

When I try to use CURA an connect the printer via USB, my USB cable burst in FLAMES!!!!!!
also this short circuit damage the USB port in my computer...

I did some measurements with my voltmeter and found that the power supply ground was at 12V. Everything was correctly connected!.
I found that the M4 screws fixing the power supply to the acrylic wall were shorting the 12V rail to the PSU physical ground. The right-bottom one is directly behind of the 12V rail of the PSU, and if you use the M4 screws recommended in the instruction DVD, you will go trough the plastic film and short the ground of the PSU to the 12V rail.

Please guys be careful! Do not over-tighten this screws, use shims to avoid going through the film inside the PSU, or simply do not put the Bottom-right screw. Your USB cable and port are in high risk, I think this is even a fire hazard, I hope you take it into account.

Regards
Francisco