Recording related

When I try to record sound, the software just creates noise. What is the problem? And only that noise is recorded. I uninstalled and reinstalled, resetted all the functionality of software, restarted the laptop but nothing changed. What could have possibly gone wrong?

What are you trying to record?
What equipment are you using?
Which version of Audacity?

Generally recording. Tried recording my voice. It worked for the very first time when I installed it. But after that I could only hear noise whenever I pressed recording button.

The audacity version was 2.4.0. That was the available current version.

No equipment just the microphone of my laptop, it recorded good sound when I tried for the first time but afterwards I have no idea.