20 Most Recent Logitech Cordless Desktop MX 5000 Keyboard/Mouse - Page 8 Questions & Answers

Input into your search 'error code 19' and it will instruct you on the problem and the fix.

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Unless absolutely necessary upgrading can be fraught with OS incompatibility issues as you have just found out. Either live with it, get another new keyboard, get a patch, or go back to prior OS

810-000755 is the part number for the Logitech C-bt44 USB receiver for the Logitech Cordless Desktop EX 100. See http://support.logitech.com/en_us/product/cordless-desktop-ex-100-product/faq#link_19321 . This is the section of the FAQ on using the EX 100 with other USB receivers. The receiver lets select Logitech wireless keyboards and mice communicate with the computer that has this device plugged in. The 810-000755 also works with the Logitech cordless desktop (keyboard/mice) EX 110, and the MK 300. There may be other keyboards and mice that communicate with this receiver. However, newer Logitech keyboards and desktops (keyboard/mice) may not use this receiver. I hope this helps. Note: the EX 100 uses 2 alkaline AA batteries in the keyboard and 2 alkaline AA batteries in the mouse to communicate with the receiver. I believe the other keyboards and desktops that can communicate with the 810-000755 also use alkaline batteries which last ~6 months before they must be replaced. Cindy Wells

No first I have read this.

Possibly, although new, it is simply defective. You can try reinstalling the driver. But here is a "tester": http://www.keyboardtester.com/ Here is a link to Logitec support: http://support.logitech.com/en_us/home

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