Go update your Realtek audio drivers from your computer laptop manufacturer. Your Realtek audio drivers is likely outdated, corrupted. Log entry shows OBS has initialization problems.
21:38:39.454: [WASAPISource::TryInitialize]:[Speakers (Realtek High Definition Audio)] Failed to get initialize audio client: 88890008 21:38:39.454: [WASAPISource::WASAPISource] Device '{0.0.0.00000000}.{edb4bf6c-c6d3-4150-a0ae-ee19fda0d61e}' not found. Waiting for device 21:38:39.539: WASAPI: Device 'Microphone (Realtek High Definition Audio)' initialized
Then, after you update the drivers, go to Windows Sound Control Panel and make sure you enable the default playback to the Realtek audio device associated to your Speakers. Also make sure your default recording device is set to your Mic.
Understand also that you are using a mobile graphics GPU. A GTX 960M is slow compared to today's standards. If you are to play PC games with it, you will need to turn down in game settings to medium, if not the lowest settings. Make sure you go to Nvidia and update the drivers for it as well with GeForce Experience software.
1:38:37.128: Available Video Adapters: 21:38:37.133: Adapter 0: NVIDIA GeForce GTX 960M
