I have a Wallstreet that one day froze. I tried to re-boot with no results. When I closed the screen and re-opened it , now I get nothing. Resetting the PMU works, I hear the fan whir for a second and the green light blink but no restart when I press the power button. The battery lights indicate a full charge and the AC is plugged in. Is it more likely to be the PMU batteries, logic board or processor. Any help would be much appreciated.