You can easily check your Wi-Fi signal's strength, right down to the exact dBm levels, on a Mac or PC computer. Business Insider Subscribe Newsletters ...

If you are due for an upgrade, there may be a red circle with a number over the gear icon. 3. It might take a few minutes for your computer to load and display the latest update for your computer.

A red badge on the icon indicates that the printer is currently printing, and the number on the badge shows the number of jobs in the queue. Open Print Queue from System Preferences : Go to System ...