I too had a similar problem with my apple wireless keyboard. I turned the keyboard on and got a steady light for about 6 seconds and then a rapid blinking for around 2 minutes and finally the green light went off. There was no connection between my laptop and the keyboard.
My solution was to click on Set up Bluetooth Device, while it was searching/scanning for new devices, I switched the wireless keyboard off then back on. The set up assistant flashed up a passcode to type into the wireless keyboard and once I pressed return, my computer recognised the wireless keyboard again.
I'm sure it won't work for everyone but it might be worth a try if you've tried everything else.
My solution was to click on Set up Bluetooth Device, while it was searching/scanning for new devices, I switched the wireless keyboard off then back on. The set up assistant flashed up a passcode to type into the wireless keyboard and once I pressed return, my computer recognised the wireless keyboard again.
I'm sure it won't work for everyone but it might be worth a try if you've tried everything else.
Sep 21, 2017 Logitech Anywhere MX mouse has a blinking light and stopped working. It blinks yellow 3 times then red once - Logitech Computers & Internet question.