Cannot start computer. Led Start pushbutton blips four times, then shuts off.

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Aug 27, 2018
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Toshiba satellite P855 won't boot. Start button led illuminates four flashes, then shuts down.
No display, no other leds illuminated. No sound.
Power supply indicates 19.5 volts DC.
 
Solution
Most likely a dead motherboard, can't seem to find any modern info about the Toshiba blink codes, just something from almost 10 years ago https://www.technibble.com/forums/threads/diagnostic-blink-codes-for-toshiba-notebooks.19067/
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