Neither wireless keyboard nor wireless mouse will connect

After a power outage, Bluetooth on my IMac remains "Not available". The keyboard and mouse lights go on, then blink and then go out. I installed Yosemite, restarted, consulted these help pages, but NONE of the suggested solutions worked. In the Bluetooth pane, no devices are locatable, so set-up assistant will not work. What can I do?

If you have not tried the SMC reset, do that as a last resort to see if that may help.
Otherwise, there may be a hardware problem behind the symptom you noted...
•Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support
Troubleshooting the BlueTooth wireless component in the computer may be required.
Hopefully you have a good hard-wired USB keyboard & mouse available.
Good luck & happy computing!

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