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burialfiddle704
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Unknown USB Device (Device Descriptor Request Failed)

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HP Z420
Microsoft Windows 8.1 (64-bit)

help.PNGi installed all the drivers i need and 1 still only have 1 problem which is windows wont detect my usb device. i dont know why it isnt detecting 

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Brian1965
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Sorry, but just to be clear; "windows wont detect my usb device", are you refering to an external USB device you have plugged into your Z420, or is the error present with no USB devices attached?

 

If the error is caused by pugging in an external USB device, then what type of device is it?

 

If the error is present, and you are certain no external USB devices are connected, (excluding your standard USB keyboard and mouse), then it sounds like a possible system driver issue. Go to the HP Z420 Support page, then navigate to the Software, Drivers and Firmware page. Ensure your OS selection is correct, then download and install the Manageability Driver Pack.

 

 

HP Z620 - Liquid Cooled E5-1680v2 @4.7GHz / 64GB Hynix PC3-14900R 1866MHz / GTX1080Ti FE 11GB / Quadro P2000 5GB / Samsung 256GB PCIe M.2 256GB AHCI / Passmark 9.0 Rating = 7147 / CPU 17461 / 2D 1019 / 3D 14464 / Mem 3153 / Disk 15451 / Single Threaded 2551
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burialfiddle704
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so i installed the Manageability Driver Pack and it was working well at first then extracted then nothing happened. is there anything else i gotta do, something went wrong or what?

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Brian1965
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537 515 73 128
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You didn't mention if this is an internal or external USB device, so I will assume it is an internal USB device/driver.

 

Go to device manager and right click on the device showing an error. Select Update Driver Software from the drop down list, then the Browse my computer for driver software. Click the browse button and navigate to the SWSetup folder, usually C:\SWSetup. Ensure the Include subfolders option is ticked then click next.

HP Z620 - Liquid Cooled E5-1680v2 @4.7GHz / 64GB Hynix PC3-14900R 1866MHz / GTX1080Ti FE 11GB / Quadro P2000 5GB / Samsung 256GB PCIe M.2 256GB AHCI / Passmark 9.0 Rating = 7147 / CPU 17461 / 2D 1019 / 3D 14464 / Mem 3153 / Disk 15451 / Single Threaded 2551
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burialfiddle704
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it says that the best driver for it is already installed

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Brian1965
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Is the error showing with no USB devices plugged in? I.e. even if you remove all USB devices, including the keyboard and mouse, is the error still present? Have you checked the USB BIOS settings under the Security tab?

 

Try downloading, installing and running the HP Support Assistant software. It may be able to identify what the problem is. While you're at it, also download and install the HP Performance Advisor software. Both are free. You can also view and edit any BIOS settings from within the HP Performance Advisor software.

 

FYI: Bookmark the HP Z420 Support page for more resources. Manuals, drivers, etc. Make sure you have the latest motherboard BIOS installed.

HP Z620 - Liquid Cooled E5-1680v2 @4.7GHz / 64GB Hynix PC3-14900R 1866MHz / GTX1080Ti FE 11GB / Quadro P2000 5GB / Samsung 256GB PCIe M.2 256GB AHCI / Passmark 9.0 Rating = 7147 / CPU 17461 / 2D 1019 / 3D 14464 / Mem 3153 / Disk 15451 / Single Threaded 2551
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burialfiddle704
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the error is still showing with no usb devices in and no clue where to get to it

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Brian1965
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Is HP Support Assistant flagging up any errors?

HP Z620 - Liquid Cooled E5-1680v2 @4.7GHz / 64GB Hynix PC3-14900R 1866MHz / GTX1080Ti FE 11GB / Quadro P2000 5GB / Samsung 256GB PCIe M.2 256GB AHCI / Passmark 9.0 Rating = 7147 / CPU 17461 / 2D 1019 / 3D 14464 / Mem 3153 / Disk 15451 / Single Threaded 2551
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