It was molex and it melted the second I powered it on. I quick pulled the power. Lots of smoke.  .

I got one of these today. I plugged in the power and turned on my computer and the power cable going into it melted. Is my PSU the issue?

Form FactorATX
Wattage750W
Modular CablingNo
Fan120 mm
Input Voltage100 ~ 240 VAC
+3.3V25 A
+5V25 A
+12V 150 A
+12V Rails1
-12V0.5 A
+5VSB2 A
MTBF>100,000 Hours

It was the only thing plugged into the cable tree. I do have 4 other drives being powered but from different cables.