I replaced my power supply but accidentally kept using the modular cables from the old unit. I also connected the SATA power cable to the wrong outlet on the new PSU. Afterward, my SSD and fan hub stopped working. Only two of the three fans spin, and moving the fans to different ports on the hub does not change anything. The fans use unusual 8-pin connectors, so I cannot test them directly on the motherboard. Their RGB lighting no longer works, and the BIOS does not detect their speed. Could the fans themselves have been damaged along with the hub?
3 Answers
Yes, the fans may have been damaged along with the hub. Modular PSU cables are not universally wired on the power-supply side, even when the connector fits. Using cables from another PSU can send voltage to the wrong pins and destroy connected components. Stop using those cables and test only with the cables that came with the replacement PSU.
Never reuse modular cables between different power supplies unless the manufacturer explicitly confirms that the pinout is compatible. The SATA drive and fan controller are likely casualties of the incorrect wiring, and other components could also have been affected, so inspect everything carefully before powering the system again.
If a fan works when connected to a particular hub port, try connecting each fan to that same known-good port. Any fan that still fails there is probably damaged. The same applies to the RGB and speed-sensing circuitry, which can fail even if the motor still spins.
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