Question about Mercury P4VM800M7 Motherboard

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My usb drive is not support. My mercury motherboard pvm7 3.1 version is showing message unknown devices. pls help

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My mother board not support

Posted on Feb 23, 2009


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"device unknown" on every USB port

Check that the ports work OK with another device - a printer for instance. They are pretty tolerant things when it comes to connectivity. If no joy there, go into "Device Manager" (I assume we are talking about Windows) and look in "Universal Serial Bus controllers" (at the bottom of the list) and see if there are any conflicts or absence of controllers. If so you could try to get Windows to fix itself by booting up with the Windows disk in a drive and following the onscreen instructions to repair the installation.
Do you use USB for your keyboard or mouse? Do they work? Or a joystick or game controller?
If none of the above help, your motherboard is probably kaput.
You could try a PCI (or PCIe) board with additional USB ports. Not the ones that plug into the internal USB headers (if the M/B is broken they probably won't work either).
That's all I can think of without seeing the PC myself.
After that - build yourself a new PC! Good luck.

Oct 11, 2016 | Asrock ConRoe1333-D667 Motherboard

1 Answer

Usb device not reconised

This message is usually shown when the flash drive is burnt. Try to see if it presents the same message in different computers. if it does, unfortunately it is damaged beyond repair.

If it is recognized as a drive, but it is asked to format the flash drive, try formatting it and see if you can copy and delete files from it. If you cannot, it is really burnt.

Hope you may find this information helpful!


Miguel L. Martins

Nov 08, 2013 | SanDisk Cruzer Blade Usb Flash Drive 8 Gb...

1 Answer

Running windows XP home edition get message USB

Try reinstalling the motherboard drivers, maybe something is wrong with the USB controller.

Jun 07, 2009 | Computers & Internet

1 Answer

When I plug my 4gb flash it say malfunction and not recognize

have you tried putting it in a different usb port if you tried that try updating your computers usb drivers from the support site for the computer your trying to use the flash drives on

May 28, 2009 | Transcend 4GB JetFlash 110 USB 2.0 Flash...

1 Answer


please check the device manager if USB is enabled there
to go to device manager
start menu > run > type in without quotes"devmgmt.msc" > the device manager look for usb (universal serial bus controllers)

if they are ok ( there shouldn't be any exlamation sign next to any usb device check expanding the title for universal searil bus controller)
neither they should be disabled no cross should be there next to them

then go to computer management by going to

start menu > rin > type in without quotes 'compmgmt.msc' >
removable storage > right click > properties > security > use, control, modify should be allowed for your user name

if this is also right click on disk management in same window and then insert the usb drive in check if it detects and show here, if it shows format the drive as fat

and now when you insert it the next time it will show automatically

if any of the above doesn't work

restart the system and then press F2 /delete key (whichever applicable in your case) to enter bios at mercury logo and check here if usb is enabled or not. if disabled enable it and follow the above steps again.

Further Queries are welcome
if you think my answer was helpfull please do rate me

Feb 20, 2009 | Mercury Computers & Internet

1 Answer

Onboard USB prrs malfuntion

Try re-installing the motherboard drivers. Here's a link:

Hope this helps

Chris (ziraffa)

Dec 20, 2008 | ASUS M2N-MX Motherboard

3 Answers

Transcend 4gb pendrive not being detected in Win XP

my 4gb pendrive is not detecting in my win xp operating system,before 2,3days i repaired my operating system,after that it is not detecting..pls help me

Jul 23, 2008 | Transcend (589307) Media

4 Answers



Mar 04, 2008 | Mercury KVM266PM-U (KVM266PMUD1600)...

1 Answer

Usb problem

You shouldn't need the USB driver 2.0 from mercury because windows installs this with SP2. Suggest you un-install what you installed from mercury & update your version of windows (completley), through "Windows Update". Once windows is all updated & you have finished with a reboot. Plug your pen drive in a opened usb port. Open windows explorer. Scroll down & you should see an icon (left side of explorer), thats named like, Removable Disk. Give windows time to see the device. After a few minutes if your pen device does not show up try another usb port. One you know does work. If after a couple of minutes go by & you still don't see the device listed in explorer I would say the device is defective. Your Mp4 uses a cable to connect to the usb. Try connecting to another PC's usb port. It is possible the cable is dirty or bad.

Jan 13, 2008 | Mercury P4VM800M7 Motherboard

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