How do I use a multimeter?

[MuchToLearn1234]

How do I use my multimeter to test if everything is alright with my circuit board, please explain like i'm five years old and give an example.

I dropped my piano and now when I try to play high or very low notes or have the volume up too much the piano just cuts off. Now it won't even turn on at all?

 

[Bluejets]

When things are dropped, look for anything broken as it is a good sign.
I think explaining how a multimeter works is a LITTLE bit taxing on the resources here , especially since your knowledge level is zero.
There is ample instruction already out on the internet.

 

[Cannonball]

We would also need a schematic to be of any help.

It is good to know that you are only 5 years old and have an interest in electronics.

Just keep on trying and get an adult with some electronic knowledge to help.

 

[(*steve*)]

It is good to know that you are only 5 years old and have an interest in electronics.

I'm not exactly sure that's what was meant

@MuchToLearn1234 I would advise you to post some images. We may be able to spot the problem or direct you to take more detailed photos.

 

[kellys_eye]

How much is the keyboard worth to you? How much would it cost to get a replacement?

Weigh up the cost of a (decent) multimeter and the time taken to learn how to use it you MAY be able to purchase a replacement for a lot less.....