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  • Are the USB devices self-powered?
    – harrymc
    Commented Sep 22, 2019 at 10:35
  • 3
    If the power is staying on when the computer is powered off (and it's not powered externally by a separate plug, then you likely need to look in the bios for how to disable this, however without knowing the device details (specially the motherboard in this case) it's impossible to explain in any more detail. Commented Sep 22, 2019 at 12:12
  • 1
    As @djsmiley2k says, in systems I've seen USB power when the computer is off is controlled in "BIOS".
    – pbhj
    Commented Sep 22, 2019 at 12:17
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    Did you check your bios/uefi for any usb settings
    – Moab
    Commented Sep 22, 2019 at 16:19
  • As other comments have mentioned, newer systems allow charging USB devices while the PC is off. This setting is generally controlled in the BIOS/EFI (ASUS & Dell articles on it). Alternatively some USB hubs allow individual ports to be turned off (ex: SABRANT) so that could be utilized
    – gregg
    Commented Sep 27, 2022 at 21:21