Sounds like your Leakshield is not getting power. Is your USB cable a 5-pin header connector on both ends or a 5-pin header connector on the Leakshield end and a regular USB2.0 type A inline connector on the other end? I ask this because you mentioned trying to plug it into a USB3.0 port, which do not have 5-pin headers.

Have you double checked that the 5-pin header connector is plugged into the Leakshield with the proper polarity? There is no keying to prevent plugging in the 5-pin USB header backwards and it is an easy mistake to make. If the USB cable has 5-pin header connectors on both ends, then you need to double check that the polarity is correct on both ends. If either end is reversed you will not get any power to the Leakshield.

OK it sounds like you have confirmed that you now have the 5-pin USB2.0 connector on the cable that came with the Leakshield (AQ-53215) plugged into a mobo USB2.0 header, and you have confirmed that its plugged in with the correct polarity. It's still not clear to me what a USB3.0 port has to do with this. A USB3.0 header uses a different connector and I don't think the AQ-53215 cable could even plug into a USB3.0 header. I have never tried to plug a USB2.0 5-pin connector into a USB3.0 header before. Maybe it does fit but I don't know if the pinout is the same and I would not recommend trying it. It should only go to one row of a standard 2-row 9-pin USB2.0 header on the mobo.

I think the 3-pin connector you asked about is the "Signal" connector. Aquacomputer makes the AQ-53216 cable. One end of this cable plugs into the Signal 3-pin port on the Leakshield. The other end plugs into the case power switch header on the motherboard. The wires from the case power switch that were on that header then "piggy back" on the Signal cable. In AQS you can set an alarm that if triggered will put a momentary short across 2 of the 3 pins. It simulates the power switch being pushed and it used to shut down the computer in the event of a pump failure or other catastrophic event. The cable is not provided with the Leakshield and is optional. You don't need to worry about this Signal connector now. It's a nice to have feature but not required or essential to operation.

Hi,

Could you supply some more information on your components, like a Bill of Materials list?
What components do you have in your system?

Regarding the hose to the fill port; push the blue ring slightly in (inward towards the port) while pulling the hose out.
It's responsible for clamping the hose so it doesn't accidentally go out on its own.

The color of the GND (ground) wires on the USB are black.So pin number 7 & 8 on the USB 2.0 connector.
You can't really use the USB 3.0 ports, the pinouts are very different.
The small micropin is also a bit tricky. I however managed to push the connector in with the wires straight in.
Rule of thumb with connectors; if you have to 'force' it, its not oriented correctly.
You're right that the 5 pin is for USB, 4 pin is for RGBpx. The 3 pin is for shutting down power in the event of a major pressure drop.
I hope I can be of more help.

Splitty9 is designed that you connect each fan individually to it with 1 fan connected to the RPM header, then connect it by one cable to your PWM mobo header

Question; is the water temperature changing?