I bought three LEDs, three 1k ohm resistors, and some wire. When I bought the LEDs, I made the person show me that they worked. He connected the negative end of the LED to the yellow wire, and the positive part to the resistor, which he then connected to the black wire. The LED lit up. As far as I know, the yellow wire is the 12v wire, and the black is the ground wire. At home, I spliced the wire into three wires, and connected the three diodes in parallel in the same manner. The diodes didnt work though. Also, my comp refused to start up (kept on getting rebooted again and again). What could I have done wrong? I dont even know if the diodes work anymore. I may have connected them incorrectly once, cause nothing happened the first time I did do it the right way. I dont have a lot of equipment to test the diodes (almost none in fact). Could I test them in some way?