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Dell Inspiron 5521 successfully starts not every time

I have Dell Inspiron 5521 with motherboard VAW01 LA-9101P REV 1.0(A00) and BIOS A12. Its battery is dead.

Laptop successfully starts not every time. I have to do from 5 till 10 attempts to turn it on.

After I press power button its leds light up, cooler starts working, but display not turns on, after some seconds laptop turns off.

Once it successfully turned on it works fine and correctly turns off.

What can it be? How to fix it?

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