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Mike, Mac Medic
Category: Mac
Satisfied Customers: 8996
Experience:  Over 20 years IT experience with Apple computers in publishing, marketing and design.
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MacbookPro, osx Yosemite, I think so. I am trying to, but

Customer Question

JA: What OS X (Operating System, e.g. Sierra, El Capitan, Yosemite, etc.) or iOS are you runninng?
Customer: osx Yosemite
JA: Have you installed any updates recently?
Customer: I think so.
JA: What troubleshooting have you tried?
Customer: I am trying to, but failing, to link my new Logitech k480 to bluetooth. blue tooth is on and laptap is on. also I have pressed os mac button on mac. Also I have my Mac searching (under bluetooth) for my new keyboard
JA: Anything else you want the Mac expert to know before I connect you?
Customer: I don't think so
Submitted: 9 months ago.
Category: Mac
Expert:  Mike replied 9 months ago.

Hi, welcome to! My name is Mike.

I am going over your question and I will be with you shortly.

Expert:  Mike replied 9 months ago.

First Download the Logitech Options and install it:

Most Logitech products are equipped with a Connect button and will have a Bluetooth Status LED. Usually the pairing sequence is started by holding down the Connect button until the LED starts blinking rapidly. This indicates that the device is ready for pairing.

Then open System Preferences and click Bluetooth.
Select the Logitech device you want to connect to from the Devices list and click Pair.
Follow the onscreen instructions to finish pairing.
Upon pairing, the LED light on your Logitech device stops blinking and glows steady for 5 seconds. The light then turns off to save energy.

Expert:  Mike replied 9 months ago.

There are very clear directions for that unit here:

Select First Time Setup

To connect to an Apple Macintosh, iPhone®, or iPad®:
Press and hold down the “i” connect button for 3 seconds.

Expert:  Mike replied 9 months ago.

Connected now??

Expert:  Mike replied 9 months ago.

Were you able to connect the keyboard?