PSU Molex connector question

[Aregvan]

So I have this led light strip thing which is 12 volts, so is the Molex 4 pin connector. So I found out which is the plus/minus on the wires and the Molex. When I connect the two, the led goes on. When I leave it connected for more than a second, the Molex gives off a spark, and the comp restarts.

Mobo: Gigabyte 990fxa-ud3
Cooler master 500w PSU
Asus gtx 460
8gb DDR3 1333

Why is this? They are both 12v, what am I doing wrong?

This is the LED strip:
http://www.amazon.com/Truck-Flexible-Waterproof-Light-Strip/dp/B004Y9YIU6

 

[Brett928S2]

Hi

Thats for a car/truck.....NOT a computer.....

All the best Brett

 

[Aregvan]

Hi

Thats for a car/truck.....NOT a computer.....

All the best Brett

12v is 12v

 

[hunter315]

Yes, but you have no idea how much current it is drawing. A car battery can supply an extra 10 A easily, an extra 10 A load on your power supply would be quite significant, and if its a cooler master extreme power plus 500 W, 10 A extra on the 12 V rail would throw it over its limit.

I see no mention of how much power those lights need, which means you have no idea how much current its trying to pull from your power supply.