I accidentally turned off the bluetooth on my mid2011 imac-now neither my trackpad nor my keyboard will work..and I don't own a usb mouse..what next?

Easier solution: command-spacebar, search for Bluetooth File Exchange, arrow down to select it, and it will prompt you turn on Bluetooth. Click Enter.

When you turn off your Bluetooth and you have a wireless mouse, all you have to do is turn off your computer on the back of it and restart it and turn the light on your keyboard on, if it is off. You can start using your mouse immediately when it reboots and sign in

I Stupidly did the same thing without thinking that all my controls are Bluetooth & I don't own a wired mouse. I just turned the computer off with the power button , then turned in back on. Let it boot up and it automatically reset the Bluetooth back on. Everything worked. I have a late 2012 iMac. I was much relieved.

This might not be the same issue, but:

I have a mid 2010 27" iMac that occasionally loses all BlueTooth connections. I just had a chance to test this.

I found my iMac just starting to run the screensaver. It was looking for pictures, then found them and began displaying them. None of my three Apple BlueTooth devices (keyboard, Magic Mouse and Magic Trackpad) worked. So far, this is just like all the other times this has happened.

I recently got a wired Apple trackball mouse, and plugged that in. It woke the iMac, and gave me a cursor. I could use the menu bar BlueTooth icon to see that BlueTooth was off. I could not turn it on with the menubar icon.

I tried to turn BlueTooth on with BlueTooth preferences and that didn't work either.

I could log out, but couldn't log back in because logging out did not bring the BlueTooth keyboard back on.

A soft restart worked, bring BlueTooth back up as usual.

Console reports

07 24 12 9:03:04.000 PM kernel: E:[AppleUSBBluetoothHCIController][StartBulkPipeRead] ClearPipeStall failed with error 0xe000404f

This is an error that I've seen in other instances where BlueTooth has failed. I've also seen this reported on the web.

As this seems like a software problem, I'm holding out hope for a fix in Mountain Lion.

What happens if you flip the on/off switch on the keyboard?

Bluetooth: How to set up your Apple Wireless Keyboard

Hi..

You're going to need a wired (USB) mouse to turn Bluetooth back on.

Either from the status menu bar (top right in your screen) or from System Preferences > Bluetooth.

Surely you can borrow a mouse from somebody. You can also buy one for around five dollars.

If you boot the iMac with nothing connected it should go into a setup wizrd. ive just tried it with an iMac ive got on the bench and was able to connect to both a Mouse and keyboard. Try Resetting the P Ram and see if that cures it.

I had the same problem and wanted to add one more solution to the list. I had a laptop on the same network which I'd used to screen share with my iMac. When the Bluetooth was turned off, I was able to use the laptop to restart the computer. So, on the off chance you have another computer on your network, you may be able to control the mouse remotely.

I used the Screen Share application from a MacBook, you can activate it from Finder just need to be on the same Wireless Network.

power cycle does the trick on a late 2013 model iMac.

Thanks philbert66. This solution worked perfectly for me on an iMac running Sierra (vers. 10.12.2).

Reset the SMC (no peripherals required).

Barry

This is only useful if you have a wired keyboard, but a wireless mouse.

If you're using a MacBook, both the keyboard and trackpad are wired, so turning off BlueTooth shouldn't be a problem.