Member Avatar for mach69

i have an asus m2n32 slideluxe motherboard amd 4200+ dual running windows xp but just today started this problem when i shut down the fans stay running and hdd light stays lit . can anyone help me finger it out ?

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In response to : when a system does not fully power off the root causes are usually one of four things — standby power being held by attached hardware, BIOS power/wake settings, the OS not entering the S5 (soft‑off) state, or a PSU/motherboard fault. 's note about a powered USB hub is a common and easy-to-check cause.

  • Remove all external peripherals (especially externally powered USB hubs and card readers) and shut down. If the system powers off normally, the peripheral was backfeeding standby power.
  • Enter BIOS/firmware and inspect Power Management (APM/ACPI) options. Disable any "wake on USB/PCI/RTC/WOL from S5" or similar settings, save and test.
  • In the OS, verify ACPI is in use (Device Manager -> Computer shows an ACPI entry) and disable "Allow this device to wake the computer" for network adapters and USB host controllers.
  • Test with minimal hardware (one stick of RAM, CPU, video, no extra drives or cards) to rule out add‑on cards or devices holding power.
  • If the above fail, suspect the PSU 5VSB rail or motherboard power circuitry. Swap in a known-good PSU or have the system checked; do not open the PSU yourself.

BIOS updates have resolved ACPI/standby bugs on older boards, so apply an official update only after confirming compatibility. Work with mains power removed and take standard ESD precautions.

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Member Avatar for caperjack

not sure but i had same problem once when i had a power usb hub plugged into the my board .

Member Avatar for The New Normal

can anyone help me finger it out ?

I think you may be taking your computer love too far

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