Arduino mega is invisible to your computer

I have windows 10 and a Arduino mega.

when I try to upload to the Arduino I get this message

avrdude: ser_open(): can't open device "\.\COM4"

when I checked, the ports tab was gray and in the manager I could not find the Arduino. Also the power LED is on so i'm not sure what to do.

Depending on where you bought your Arduino it may need drivers.

Instructables link here (ignore that its for different board)

Or another link here

Also which IDE are you using JIC it matters ?

How are you connecting it to your computer? I had a similar problem with a ProMini using a CP2102 Breakout UART and I just googled “CP2102 driver” and found the corresponding driver for my operating system. Worked after that.