Laptop speaker makes crackling noise

One of the laptop speakers make crackling noise. Reinstalling the operating system and audio driver does not fix the problem.

1. Failed laptop speaker.
2. Failed sound card.

Sound stutters when laptop is moved or lifted

Sound stutters while playing an audio file from the laptop hard drive. The problem happens only when the laptop is moved or lifted.

Hard drive protection is enabled.

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

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