IMac not recognizing bluetooth nor USB mouse and keyboard

The iMac I use has suffered a pretty annoying problem. I typically use a wireless keyboard and magic mouse with the iMac (I could be wrong, but I believe these both use Bluetooth technology). First, the iMac stopped recognizing these. They kept losing connection last Friday and then suddenly stopped recognizing them at all. Yes, they both have full batteries and blink to show me they are on and searching for the iMac.
Second, I tried using a USB mouse and a USB keyboard to get into the iMac and fix the problem. But neither are recognized by the iMac as well. The mouse is a Dell model that has a red light on the bottom, and it glows red for less than a second when I plug it into the USB port before going dark again and not working. So, I can't get into the iMac to fix the problem.
I've read a few other things on the community boards. I restarted the iMac. I unplugged it completely for several minutes and held down the power button for fifteen seconds while the power was unplugged. I've tried multiple mice and keyboards, all to no effect.
Is the iMac not recognizing the USB keyboard/mouse because it's still searching for the bluetooth versions that it will no longer recognize? Is there a way to fix this without setting up an appointment with the geniuses?
Thanks!

I'm having the same problem. It started happening on my Late 2012 model iMac 21.5" after applying the latest update.
What I found was that nothing seemed to work connected directly to the iMac. However, if you attach an externally powered USB hub, then all devices attached to the hub will work. It seems as if the USB ports are still working, but without power.
After I was able to get my USB keyboard to work, I was able to zap the PRAM (hold command-option-P-R while powering on) and then magically everything was back to working again. Unfortunately, this was short lived as the problem has resufaced again for me today, but you could give it a try anyway.

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Any advice/thoughts/suggestions appreciated:
All 3 USB ports at the back of my iMac have stopped working. This means I can't use either a keyboard or mouse, so have no way of logging in. I turn my iMac on, it boots up as usual, but when it gets to the login screen, the mouse and keyboard don't work and I get a message about bluetooth set-up. (Both my mouse and keyboard are wired, not bluetooth).
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2. Unplug the computer's power cord.
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Dear Customer,
Welcome and Thank you for posting your query on HP Support Forum
It looks like you are having issues with the Keyboard on your Notebook.
We will surely assist you with this.
Let’s start with a questions.
1. Was there any liquid split on the Notebook Keyboard
2. Is there any Dust settled on the Notebook Keyboard
3. Are there any Keys which are fallen off / Any Keys which are loose
Troubleshooting:
Step 01. Could you please check and verify if External Keyboard works fine or not?
Note: Please click on the below shown link to find more troubleshooting steps
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03738933&tmp_task=solveCategory&cc=us&dlc=en&lc...
Hope this helps, for any further queries reply to the post and feel free to join us again
**Click the KUDOS star on left to say Thanks**
Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.
Thank You,
K N R K
I work on behalf of HP

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