820-2915 pulsing


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820-2915 reboot each 6 seg.
With RAM Cpu core present but each 6 seg dissaper for 1 seg
Without RAM cpu core always present.

Any idea? It is not liquide damage board.

Just talked with the customer. He worked with the laptop and shut it down and next day turn on wihtout image.
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Could be anything really. I suspect bad GPU or CPU or BIOS. Or the customer is lying and something else happened.