Sound output and input problem

Have you done a PRAM reset, CMD+Option+p+r...

Reset NVRAM on your Mac - Apple Support

In fact, do 3 in a row, takes a bit of time.

Intel-based Macs: Resetting the System Management Controller (SMC)...

Reset the SMC of your Mac - Apple Support

BrendonCeph wrote:

My macbook pro 2012

does not have sound output and input devices. What do I need to do?

Try plugging in headphones/ external speakers and compare your results.

See your ~/Applications/Utilities/Audio MIDI setup.app for some clue

ref: Audio MIDI Setup User Guide for Mac