Returning to computer found blue screen. Could not turn off computer by pressing power button - no response. Removed power cable and battery to turn off computer. Replaced battery and power cable (battery is fully charged, power seems to be working) . Green light is blinking very slowly. No response to pressing or holding down power button. Tried trick of removing cable and battery, holding down power button, replacing cable - no response to pressing power button. No previous hints of problems. Power button always previously worked. Is there any way to revive it?
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