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Since I upgraded from Yosemite to MacOS Sierra, the sleep, restart and shut down functions all restart the computer. Any ideas would be very welcome, otherwise i have to shut down by holding down the power button, which is a bit annoying. I'm not too bothered about sleep since I don't use it...

I just installed Sierra with no difficulty at all. However when I turn the machine on it shows a bogus warning that a USB device is using too much power and i have to unplug it to re-enable USB functionality. It's not true at all but it's annoying, cosmetically speaking. Any help would be...