Power button broken and can't switch on phone I have HTC One mini. Power button is broken and can not turn it on. Phone is not rooted and unfortunately usb debugging is not turned on. Any ideas what to do? Or at least how to enable usb debugging?

I tried ./adb reboot but it can not find device
I am not sure if this will really help you out or not but it is worth a try.
Make sure you have fastboot and USB driver for your phone is installed on your PC

Connect the a USB cable to your phone and keep on pressing the volume down button while the phone is booting.
If you are able to access the fastboot mode then you are saved and you can try fastboot reboot command.

If your phone is not entering into fastboot mode then go to a nearby shop and get the power button fixed. I think there is no other way you can turn on your phone.