Windows 10: Why isn’t my monitor and keyboard displaying anything but my pc is working

So I bumped my knee on my desk by accident and everything like shut of and after I turnt my pc back on it worked fine but my monitor and keyboard aren’t lighting up or displaying anything and I have tried checking cables and everything seems to be normal so I don’t know what happened

:)

 

Printer isn´t working after latest update.

After the latest update from Windows, my Canon Pixma ip6600 printer isnt working. In Device Manager it shows up as working properly but when I go to print it isn´t listed as an option in any programs. Troubleshoot suggests it´s a USB 2 printer on a USB
3 port and that that´s the problem but that cant be since it worked fine before the update. I´ve tried to uninstall and plug it back in but that doesn´t work either.

 

Cortana isn´t working

When I hit enter, it did something, but there´s still no Cortana, even after restart. So I tried it again, but now it says that it failed, because it´s already installed and it´s working in PC. So it should work, but Cortana still isn´t here.

 

no sound after connection dell monitor through hdmi

Thanks for the response. I have done it already as you suggested and now all OK.