|I'd be careful with any bios updates. |
Laptops are pretty hard to fix. I'd try to remove the battery and use only the AC adapter. Then try it. The other swap would be to get a known good and charged battery but they are not cheap.
Sometimes you can try this and once in a while it works. Remove battery and ac cord then press power button a few times. They try ac only to see if it can start.
A tech may be needed to see if the ac adapter is providing enough power and the right voltage and free of ac component. Again it would be nice to try a known working ac brick.
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