Logitech unifying reciever no longer works on ALL USB ports

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.

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.

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.