- Aug 17, 2025
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So, I'm having a weird problem. Yesterday, I decided to change my motherboard (that was LGA 1155) to a Xeon Mini ITX motherboard (that is LGA 1356). Everything was working fine before replacing the motherboard, and after replacing everything is working great too, BUT the frontal USB panel.
It's not working. If I plug any USB devices, it doesn't get detected. While testing, I decided to plug a phone charging cable that has a small screen to monitor the watts (unfortunately I don't have a multimeter or anything like this), and with the cable, I noticed that the frontal USB ports are drawing an extremely low current, as the screen on the cable lits up very dimly, and as soon as I connect my phone to the cable, the cable doesn't send any energy to the phone, as there's not enough energy to send to it (the cable screen goes to 00W, as if it was turned off).
Also, while testing, I noticed that the current being sent to the frontal USB ports is not stable. With the cable, I noticed that the screen keeps "blinking" - not even blinking actually, it's like if the brightness (and the current) was varying.
Knowing this, I feel like there's something stealing energy from the frontal USB line on the motherboard. I am using a 500W PSU with a xeon E5 2470 V2, 16GB DDR3, an RX570 4GB Gigabyte, 2 Sata SSDs, a tower cooler for the CPU and another small cooler to help keep the air outside. The motherboard uses 2x4 ATX pins for the CPU, and every cable needed is plugged.
I don't think that it's a PSU issue, as i was using it with the old motherboard (also Xeon, E3 1270) and I didn't have any issues, and this PSU can handle sending a lot of energy as it has 2x4 ATX and 2x 8 pins PCI-E.
So, knowing all of this, what do you guys think that could be causing the problem? There's an NVME slot next to the F_USB pins (it's between the CPU and the NVME slot), and it's not being used as I don't have an NVME. Maybe the F_USB shares energy with the NVME slot, and it only sends enough energy for the F_USB if there's an NVME connected? (I don't have any idea, I'm just making up a theory)
It's not working. If I plug any USB devices, it doesn't get detected. While testing, I decided to plug a phone charging cable that has a small screen to monitor the watts (unfortunately I don't have a multimeter or anything like this), and with the cable, I noticed that the frontal USB ports are drawing an extremely low current, as the screen on the cable lits up very dimly, and as soon as I connect my phone to the cable, the cable doesn't send any energy to the phone, as there's not enough energy to send to it (the cable screen goes to 00W, as if it was turned off).
Also, while testing, I noticed that the current being sent to the frontal USB ports is not stable. With the cable, I noticed that the screen keeps "blinking" - not even blinking actually, it's like if the brightness (and the current) was varying.
Knowing this, I feel like there's something stealing energy from the frontal USB line on the motherboard. I am using a 500W PSU with a xeon E5 2470 V2, 16GB DDR3, an RX570 4GB Gigabyte, 2 Sata SSDs, a tower cooler for the CPU and another small cooler to help keep the air outside. The motherboard uses 2x4 ATX pins for the CPU, and every cable needed is plugged.
I don't think that it's a PSU issue, as i was using it with the old motherboard (also Xeon, E3 1270) and I didn't have any issues, and this PSU can handle sending a lot of energy as it has 2x4 ATX and 2x 8 pins PCI-E.
So, knowing all of this, what do you guys think that could be causing the problem? There's an NVME slot next to the F_USB pins (it's between the CPU and the NVME slot), and it's not being used as I don't have an NVME. Maybe the F_USB shares energy with the NVME slot, and it only sends enough energy for the F_USB if there's an NVME connected? (I don't have any idea, I'm just making up a theory)
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