![]() Accidental shorts can definitely cause the full system not to run. Or maybe the stacking thing can allow a reversal. Maybe one of the index guides has been broken off allowing a reverse condition. Molex Wire-to-Wire solutions provide a variety of cable/wire types and sizes with numerous options to fit your application needs across most industries including connector types that fit applications requiring high-power, microminiature, sealed, rugged, and reliable solutions. ![]() If you could post a pic (closeup of all the fan connectors you've been using) we could possibly tell what's going on. Decent fans are polarity protected with a diode, so they won't run if plugged in in a reverse polarity - usually you'd have to force the connector to do that as they have guides to line them up properly. You can usually disable that CPU protection feature in the BIOS setup. ![]() A 3-pin connector, a 4-pin connection, and a MOLEX connector are displayed from left to right. However, conventional MOLEX 4-pin peripheral connectors are also employed. Some systems won't work without a properly working fan with a working speed sensor connected to the CPU fan header, so if you were trying to power the LED lead separately and from the CPU fan header, then that might be your problem. Dedicated 3- or 4-pin fan headers are frequently utilized in modern systems. the molex conector usually sets the fan to run 100 constantly, the 3 pin. But NONE of this should cause your system to die unless you have some polarity reversed or some short somewhere. My old case had a fan with just a 3 pin connector which I had plugged into the motherboard and thats how Ive been rolling for a few years now, but I see a lot of people saying that its preferred to use the molex connector and plug it into the power supply. You can use one of the 3-pin to Molex (PSU) adapters on the LEDs to do that. For the LEDs to retain full brigtness while allowing the fan speed to be controlled, you unstack the connectors and plug the LED connector onto uncontrolled power and the power connector to the controlled voltage. ![]() If you do stack them together, then both get the same power. The 3-pin LED connector stacks onto the 3-pin power connector. ![]()
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