Elegoo Uno not registering

So I bought an Elegoo Uno R3 over the summer and it worked fine. Haven't used it in awhile, so I plugged it in today and the board turns on, however the online IDE does not recognize it is plugged in. The orange light is solid and not flashing. Should I get a new board directly from Arduino or is there an obvious fix for this knockoff board that I'm not aware of?

Please explain what you mean by "the online IDE does not recognize it is plugged in". Are you saying that the port of the Elegoo Uno doesn't appear on the ports list?

Which operating system are you using?