Importance of spread sheets

You turn your computer on and the computer will not boot up where is something you should do to diagnose the problem?

David is in week 3 of his current ashford course and has a paper due by monday night at midnight. he has finished everything but the concluding paragraph. as he boots up his computer to work on it, he sees a flash across the screen and then the screen goes black. he begins to panic as he tries desperately to turn the laptop back on. david should have saved his work on what kind of portable device?

List the five on-board vehicle subsystems