Q: can i use a wireless keyboard with my IMac

Your computer like most modern Macs has bluetooth support built-in for keyboard, mouse, trackpad, etc so an external wireless BT product can be set up in the System Preference> Bluetooth panel, and also there is an item useful in the Keyboard + Mouse panel there, too.

The USB Keyboad and mouse are very handy to have on hand, since there are times when the wireless keyboard and mouse may not work, but the wired variety will; so these are invaluable in troubleshooting issues when a bluetooth model may not be seen by the computer.

The Help viewer in your Mac OS X should be searchable for more Bluetooth and BT Keyboard setup information. The BT products have to be paired or recognized by the system to be used by it.

Good luck & happy computing!

How can make my wireless keyboard with no USB port discoverable?

If the computer has no working USB ports, that indicates a need to have

the device inspected to see if the logic board or other circuits are broken.

To have the computer inspected and tested for hardware issues may be

a priority. You could try different ports w/ USB keyboard, to see if only the

first one you've had issue, is/was defective. This involves troubleshooting.

Additional USB keyboards are good to have on hand for this purpose.

Even a windowsPC keyboard could be used, though keys are different.

• Keyboard Mappings using a PC keyboard on a Macintosh:

https://support.microsoft.com/en-us/kb/970299

Depending on the age and build model of the iMac, there may be help in

resolving hardware issues at an Apple Store (genius appointment) or with

an authorized Apple service provider; where fees for service may apply.

The pairing of Bluetooth to the hardware requires access, usually first by

use of the USB keyboard. (unless other means, wireless or by internet

were set up well in advance; such as use of advanced Admin remote.)

You may need to first use a wired keyboard to look into the System to

be sure the correct settings are enabled for a wireless keyboard to be

found by the system. Either way, it is always good to have a wired USB

model on hand for troubleshooting the main computing hardware.

{Usually, you'd try & start a new discussion; sometimes that doesn't work.}

• Using a Bluetooth mouse, keyboard, or trackpad with your Mac - Apple Support

Info on how to do most anything with BT peripherals including pairing is

covered in the above Support article; there are internal links to others.

And other third-party articles often point to or use Apple support information:

http://osxdaily.com/2014/12/30/bluetooth-discovery-problem-fix-os-x-yosemite/

Between other hardware issues, or batteries in a wireless device failing;

to be sure the effort to troubleshoot is successful, have alternative means.

{There are several 'system resets' and 'keyboard shortcuts on startup' that

may go unresponsive with a bluetooth or other wireless keyboard in use...}

• Mac keyboard shortcuts - Apple Support

• Resetting the System Management Controller (SMC) on your Mac - Apple Support

• How to Reset NVRAM on your Mac - Apple Support

Sometimes it may be necessary, if the computing device cannot see the

wireless component when the circuitry is built-in to the computer, to reset

the computer by use of System Management Controller since that also

can act as a power-management reset to help identify all hardware.

Examples above are items where it's good to have a wired keyboard on hand.

Hopefully the BT keyboard or USB wireless module-based keyboard will

be discoverable from within system settings, but it also may be defective.

Good luck in this matter!