Command C / Command V not working.

That tells us it is system-wide, so the next troubleshooting step is to boot into Safe Mode and see if it works correctly. If it works correctly in Safe Mode, then it is something you have installed that is messing with it.

How to use safe mode on your Mac - Apple Support

Check System Prefs>Keyboard>Modifier Keys

and check if command (⌘) is assigned to ⌃ Control. If it is, switch it to command.

When you open the Edit Menu, is cmd-V and cmd-C shown as the shortcuts?

Any other standard commands not working (cmd-w to close the window, cmd-A to select All).

Do you know if the Mac was erased and reinstalled for you? If it wasn't, it may be a good idea to do that since you have no idea what the previous owner did to it.

A_Sheep Said:

”Command C / Command V not working.: the shortcuts don't work in other apps either”

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Before the reinstall, try this:

Reset the SMC and your NVRAM:

Sometimes when changes are made to the system(i.e. updates), system configurations (i.e. for Ports and for the keyboard) become manipulated, technically. So, reset the SMC and NVRAM. Your hard drive may not be being read promptly, so resetting these, all of the ports would be configured to how they should be..

Create a new user account (or use Guest account) and see if you have the same problem in that account.

See if you can borrow a keyboard and see if it does the same thing or not.

I'm not familiar with Windows hardware by think it may mean that your Apple keyboard is the problem. You should make an appointment at the nearest Apple Genius bar if it's open or at an Apple Authorized Service Provider to get it tested and repaired.

Note: didn't see オレンジ's response when I replied but we both seem to be on the same page.

You might have to get an external keyboard to use until a time when you can get to an Apple store for repairs.

I'd contact Apple and talk to them about the problem so you're on record about the problem in case you can't get to an Apple store for some time. You have a year for warranty but if you can't get to where you can get it to them before the warranty runs out you'll be on record and they should extend.

In which browser please? You are using powerpoint in a web interface which means you are still at the whim of the browser. I had some similar issues when I used Safari and MS apps online, I switched to Chrome and voila, copy and paste worked.

Usually the windows key is the same as the command key, so maybe your apple keyboard's command key has stopped working.

Can you tell us what you are trying to paste into or what application you are using?

Are you trying to "Copy and Paste" files in this way or is it just text?

I'm afraid I'm Photoshop user so I turned off the ⌘-space shortcut to Spotlight as soon as I got the Mac.