PC doesn't recognize Arduino Uno

[pisky02]

Hello, I did my homework and searched the whole internet, but didn't find a solution for my problem.
Recently, I tried controlling the LED strip with audio from my stereo amplifier like in this tutorial https://www.youtube.com/watch?v=G-zCNkNp4RY, but instead of microphone input I had a terrible idea to plug my speaker output directly to Arduino analog input... so I fried my amp.
But now when I try to plug Arduino to my PC it powers up good (the LEDs are glowing), but it's not recognized at all. I checked my device manager, switched cables and tried to download drivers for my board manually, but nothing works. Is there a way to check with multimeter if I fried something on the Arduino?
There are no visible faulty components and I smelled and touched it thoroughly after the amp incident and all seemed good.

Thanks for your help.

[sterretje]

@pisky02

I checked my device manager

I guess it did not see the board?

@pisky02

(the LEDs are glowing)

Power LED should be on, other LEDs depend on the loaded sketch (or the damage done).

@pisky02

so I fried my amp

Not only. Because the board is no longer recognised, you also fried the serial-to-usb converter. And with negative voltage and voltage greater than 5V going in to the main processor (328P), the 328P will also be fried.

Throw the board away, buy a new one and take it as a learning exercise.

[gilshultz]

You have gained some valuable knowledge and now have a mechanical template for mounting similar Arduinos. The best solution is to purchase a new Arduino and a copy of the Arduino Cookbook.