Logitech unifying reciever no longer works on ALL USB ports
Solution 1:
I had exactly the same problem, just watched this simple video on YouTube.
Basically the steps are:
- taking the black cap off
- sticking a piece of paper inside making the contact points closer
- stick the black cap back on
I tried it and it works.
Solution 2:
This is typical behavior of a broken/worn down unifying receiver. The only way to fix this is to purchase another. However, you'll have to setup your old devices to the new receiver using Logitech's software.
This may have to be done with each new computer you use the mouse/new unifying receiver with. Although after a fresh install of Windows 8, my receiver picked up the mouse just fine without any of the Logitech software.
Solution 3:
If the Receiver isn't being recognized it is not necessarily broken. I plugged my t600 receiver into my pc (win 7 64bit) and i am having these same problems. I move over to my laptop (windows 8) with the same receiver and i can use the mouse with no difficulty. There is something about windows 7 64 bit that is having issues with this. Test your receiver on a different device before claiming its broken. or returning your product. Chances are you may be able to make this work.
Solution 4:
A bit late to the party but this worked for me. For some reason the usb.inf file was missing or corrupt for me.
Browse to 'C:\Windows\System32\DriverStore\FileRepository\usb.inf_amd64_neutral_e2b28ecac19a29af'
Copy usb.inf and usb.PNF to 'C:\Windows\INF\'
Update drive on unknown devices
-- In Device Manager, right-click and select Properties
-- Select Driver tab
-- Click 'Update Driver' button
-- Select 'Browse my computer for driver software'
-- Enter 'C:\Windows\INF\' in the Search for driver software in this location field and click Next
Solution 5:
I'm pretty sure I ran into this problem after Acronis Backup & Restore 11.5 imaged my disk to a .tib file.
Both the source system and the target system were apparently missing C:\windows\inf\usb.inf afterwards.
I copied it over from my netbook and an 'Update Drivers' later, had my logitech k400 wireless keyboard working again.
This seems to have affected not just logitech unifying receivers, but all USB Composite Devices. My Android tablet is also affected, as well as my Microsoft Xbox 360 USB Controller receiver, since it has two 360 pads sync'd to it, but my wired PowerA Minix360 is not affected. My microsoft wired keyboard 600 and logitech V220 are also not affected, as they are not 'USB Composite Device', but 'USB Human Interface Device'.
USB Composite Device is used to wrap up multiple child Devices in a single parent Device, such as two USB Human Interface Device endpoints (One for keyboard, one for mouse) like the Logitech Unifying Receiver does.
Big thanks to lucvdv of answers.microsoft.com for figuring it out:
Some time ago, my system stopped recognizing some, but not all USB devices.
USB ports are fine, it reads the device descriptors but then either says
it's unknown hardware or says it can't find a driver for it.
A second symptom that must have started at the same time is that it
"forgets" all about some USB devices that have always worked fine before,
with the same result: suddenly either "unknown" or "can't find a driver".
Two weeks ago, it was my keyboard.
It still worked when I logged on (it had to, I used it to enter my password).
Immediately after logging on, the found new hardware thing popped up,
after a few seconds it said it failed to install my new hardware, and at
that moment my keyboard stopped working.
Never found a solution, I've been using a PS2 keyboard instead since.
I've tried other USB keyboards, it didn't recognize any of them.
Yesterday, it was the USB hub that's built into my monitor that
suddenly turned into an "unknown device", and nothing I connect
to it is detected anymore.
In an attempt to fix that, I launched the device manager and let it
scan for new hardware.
Result: instead of my USB hub starting to work again, my
Logitech wireless mouse stopped working.
The "USB receiver" is now listed with an exclamation mark,
"drivers for this device are not installed".
It worked fine just a few seconds before.
Right now I'm back to using a wired USB mouse, but I wonder how
long that's going to keep working.
It's not the receiver that's at fault: when I plug it in,
it shows up in device management with the right name and device ID:
USB\VID_046D&PID_C52B&REV_1201 - USB\VID_046D&PID_C52B,
and status "The drivers for this device are not installed. (Code 28)".
Comparing the contents of %SystemRoot%\Inf to another Win7-64 system,
I noticed that file USB.INF was missing.
Copied it over from the other system, started device manager and
re-installed drivers for the non-working devices, and the problem is fixed.
Thanks for your patience in tracking it down, lucvdv!