I have an HP Media Entertainment PC laptop system. It will not boot up; in fact, it doesn't even get to POST. It lights up the upper set of display lights, then shiuts down almost immediately, and then repeats. There is a click at the time it begins to shut down which I believe to be the DVD, which does not work. This system has worked in the past.
Is there a key combination which, when pressed at boot time, bypasses whatever may be hanging up the system?