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Try removing the battery and power cord, then press and hold the Power button for 1 minute to discharge it.
Now put the battery back in and connect the power cord, and try turning it on again.
Let me know if that works.
If not, please let me know:
When was the MacBook Pro last turned on?
Did it work ok last time it was used?
Is there any sign of life at all from it? (any lights or beeping or fan noise)
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If there is no sign of life from it at all then the main board is likely dead and a repair would cost approximately $300+.
The main board is likely dead and a repair would cost approximately $300+.
No it is not the screen. It is the main board.
Is there anything else I can help you with today?
The electronic components on the motherboard will degrade over time regardless of use.