One laptop speaker does not work

One speaker in the laptop doesn’t work. The other speaker works properly.

1. Problem with audio settings.
2. One speaker is bad.

Laptop has no sound from speakers but headphones work fine

The laptop has no sound coming from the internal speakers but headphones connected to the laptop audio jack work fine.

1. Broken audio jack.
2. Bad speakers.

The laptop starts properly but the sound coming from the laptop speakers and headphones is garbled.

1. Software related problem.
2. Failed sound card.