Flashing Question Mark Folder
I tried updating my MacBook Pro to Mojave and it was acting up after doing so, so I decided to just wipe it and try again. When I tried wiping it, it just froze up, so I shut it down and then I got the question mark folder. I tried all the key combinations like other discussions told me to and it's just not working and I don't know what to do. I'm afraid to take it to the Apple Store because I bought it used and I don't know if they'll even fix a used computer. If there's anything I need to do or buy, I would appreciate anyone's help.
MacBook