If I were you, I would back up any critical files while you still can, and start shopping for another computer (not a Dell.) Your problem is the exact same as the problem I had with both of my Dell systems, my friends' 2 Dell computers, and another friends' Dell computer. Eventually your computer will never boot again. If you are lucky you might have a month or two before it dies completely. If you install any programs or updates that require you to reboot, I guarantee that you will encounter this problem again, and again. You may have to try booting it multiple times before it decides to work. One day it will just never boot again. There has to be some kind of flaw in the components used. I saw 5 computers, all from Dell. Die in the exact same manner that you are describing.