My computer was working fine these past few days but today I decided to do some cleaning, I did everything, organized the cables inside. The last thing I decided to do was clean up the CPU fan because it was very dusty. Everything went fine until I put everything back together and now my computer CPU fan makes a loud noise when I turn my computer on and it it says "strike F1 to try again" after few seconds it depends the computer shuts down immediately. I'm desperate, I have important work on that computer and I don't know what to do.