Hi Emma,
Do you still have your bootable USB, if you do, perform an in-place repair with it.?
If this does not solve the problems, then most likely, you do have a hardware issue.
Please follow the steps, this is then just an update and your files and applications will remain untouched.
Click this link:
https://www.microsoft.com/en-us/software-downlo...
to download the Media Creation Tool (Click on Download Tool Now), with that you can download the latest Windows 10 ISO (Select Create Installation Media for Another PC), then choose ISO, not USB
When the ISO file completes downloading
Disconnect from the Internet
Disconnect all external devices with the exception of a mouse or keyboard.
Temporarily disable any 3rd party Anti-virus you may have installed
Then, in Windows File Explorer, double click the ISO and then run Setup.exe and select the upgrade option.