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Win7 PC crash requires unplugging all USB devices to restart.

This is a discussion on Win7 PC crash requires unplugging all USB devices to restart. within the Diagnostics, Utilities and Other Software forums, part of the Tech Support Forum category. Requesting help in understanding why a Win7-64 crash that relates to an exception error due to a USB connected device,


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Old 05-05-2020, 06:56 PM   #1
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Requesting help in understanding why a Win7-64 crash that relates to an exception error due to a USB connected device, will not allow a PC restart, i.e. the power stays on but will not respond to front panel "Start" button or any keyboard sequence. Only by disconnecting all USB connections will the power go off and allow a restart. Once all the USB connector cords are removed, the power goes off, I can then reconnect the USB devices before restarting and it works fine.

The PC is a 2015 model using an AMD multi-core processor running Win7-64 (not sure it's been updated to the very last available release before support ended).

There appears to be some tie-in with the power supply (and motherboard?) that keeps the PC powered unless the power cord is disconnected. There is a power on-off switch on the back that will shut off the power but when switched back to the 'ON" position the PC will power up but not go thru a boot sequence and there is no video on the screen. I tried disconnecting only the USB device that appears in the crash report and that doesn't work. All USB cords need to be disconnected.

More of a nuisance issue, but I try to understand why the USB connections prevent power off.

Thank for any help or ideas.
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Old 05-06-2020, 07:30 AM   #2
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Everything is connected to the motherboard, and the power supply is the single source of power, which also connects to the motherboard not just for power supply, but also for some logic control by the motherboard. Failure or fault in any of the "non-related" components can and will cause unexpected issues or behaviour. Sounds like the fault is on the motherboard itself as regards the USB subsystem, and not on the external USB devices, although a faulty external USB device can easily damage the related sections of the motherboard.
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Old 05-06-2020, 11:33 PM   #3
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Thank you for the explanation. The problem generally appears when I try to change audio or MIDI interface options in music software. It happens rarely, and not a problem after PC reboots, so it's a simple fix to get restarted, just a bit odd!
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Old 05-06-2020, 11:52 PM   #4
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Next time it occurs, don't disconnect the USB devices, but long press the power button until the system turns off. The responsible USB device could not be responding to a power down request from the system, or responding to any requests at all following the exception error, and the system keeps waiting for the spooked device to respond. A forced shutdown should work without disconnecting devices.
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