My dell just went blank screen had 3 firefox pages opened up. Turned it back on every thing came back up desk top and all firefox started back up as it always dose when pages crash and the screen went blank again and will not come back on. When I push power button caps light blinks for a few minutes and then computer shuts down. This happens on just battery or plugged in also. Have taken battery out took hard drive out and put back in tried almost every thing I can. Any advise would be help full