I've one Technobit HEX 16b which is connected to SMPS with shorted green and black wire. When ever I plug in the USB cable to my laptop, the system shuts down. I tried with different laptop, the result is the same. And the system refuses to startup until the USB is unplugged. One system's date and time gets reset after this. The PSU is has proper grounding and all. Is it something to do with power leakage? Any idea? Will TP-Link work instead?

SMPS Details
SMPS 450 Watt (24 Pin)
Input Voltage Range 220V AC
Frequency 50Hz±5%
Current 4A
D.C Output Voltage: +5V; Current: 40A Voltage: +12V; Current: 20A Voltage: +3.3V; Current: 28A Voltage: -5V; Current: 0.5A Voltage: -12V; Current: 0.5A Voltage: +5V

Thanks.