No audio on playback?

I record for my gaming YouTube channel and after recording an atom zombie smasher commentary I went to listen it and couldn’t hear anything. It seems to have recorded my voice but won’t let me hear it. I can hear stuff on YouTube and in games so it seems to be an audacity thing. What do I do?

Version 2.0.3
Windows 7

You see a waveform?

Make sure the Audacity volume slider is turned-up.

Try changing the Audacity output device (the other speaker icon).

If you export (save) to WAV or MP3, can you play it in Windows Media Player?