Hearing what I have recorded [SOLVED]

I have downloaded Audacity 2.1.0 on my computer, using Windows 7. I obtained the .exe installer. Yesterday when I was recording something, everything worked perfectly and today, I can see the sound levels appearing like I will be able to hear everything when I play it back, but I can hear nothing. I don’t know what to do. I have looked in the forums and in the manual, but can’t find the answer. Can someone help me?

If you are recording from a USB device, please see: http://manual.audacityteam.org/o/man/faq_playback.html#usb

Thanks, Steve. I really appreciate your help; I can again hear what I recorded. (It’s a huge relief!)