Maybe this is a stupid question, but is the wireless working with other devices still? With your phone or other computers and devices? If it works, then obviously this is not the case, but power outages can sometimes damage your router.
If it's just the PC, then my first idea would be that that wifi is turned off in the computer settings or that Windows is in Airplane mode, as was already suggested.
My computer does not show any wifi at all. I tried everything i even replaced the pci express wireless card with a new one and it is still not working.