I got an mp3 player but when I plug it into my laptop it doesn't read it. I would really like to add music on it but I can't seem to. What is the problem

From the description, it looks like Mp3 is not getting recognized on the system.

To help you suggest steps to resolve the issue, I would appreciate if you could answer the following questions:

Have you made any significant changes prior to this issue?

What is the USB driver status showing under Control Panel?

What is the make and model of you Mp3 player?

What is the make and model of your computer?

Are other USB devices working on your computer?

I would suggest you to follow the methods given below and check.

In first place check if your computer detects the Mp3 player? Follow the steps to check that.

Press Windows and x key on the start screen and select Device Manager.

Locate the Universal Serial Bus controllers and expand it.

Check if your Mp3 player is getting detected there.

Method 1:I would suggest you to run Hardware and Devices troubleshooter and check for the issue. Hardware and Device Troubleshooter checks for any issue on the hardware and devices connected to the computer.

Run the Hardware troubleshooter and check.

A troubleshooter is an automated tool that can find and automatically fix some problems with your system. Follow the steps to run hardware troubleshooter.A troubleshooter is an automated tool that can find and automatically fix some problems with your PC

Press Windows key + X on your keyboard, Select Control Panel.

Click on Troubleshooting.

Select Hardware and Sound and click on Hardware and Devices and follow the instruction.

If issue didn’t get resolve try method 2.

Method 2: I would suggest you to run the fixit and check.

Connected USB device is not detected in Windows.

https://support.microsoft.com/en-us/kb/2830154