How to reboot laptop.

Have you tried to start safe mode when it starts, right after the BIOS check hit F8. It does sound like you might have a bad repair or reinstall and it did fail. Check your drive for different partitions, sometimes the startup disk/restore disk is copied on the other partition. Once you hit F8 it will give you menu options that you can try individually and see what might work for you. I would help to know what laptop you have and what OS you are using. I am assuming some kind of Windows machine:-)