Hello, my name is ***** ***** I'll be happy to assist you today.1. The power button may have been set to NOT turn off the laptop. This can be changed in the Power settings under Control Panel.2. The more common cause is an application is hung up and not exiting.3. Sometimes this is caused by a faulty battery, oddly enough.If you could give me some more details, I'd be happy to help narrow it down for you.What operating system are you using (Windows 7, 8.1, 10, etc.)? Are you pressing the power button or clicking on "Start" then "Shut down"?