Sounds like you may have erased the drive. Either by pushing the wrong keys and power (it happens, something hits another key), pushing power incorrectly (some will start that if you hit power a certain number of times quickly or hold it to long, or something was on the computer that erased it on you.
You may well need a CD or USB with the original installation software, which will also allow you to check the computer to see if it is indeed the problem. If you don't have it, you can download it here... https://www.microsoft.com/en-us/software-download/windows10
... and get the USB download tool here... https://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool
If you want to check the drive to see if there is anything left on it, you are going to have to either pull it (the drive) and connect it to another computer or take it to a local tech to have them look at it.
NOTE: If the laptop is under warranty, then I would contact the manufacturer.