Laptop does not post, all voltage rails present, powers on

Hello there! I have an ideapad 320 laptop and it does not want to post. Fan spins for a few seconds then stops. No display backlight either. It previously had a dead pmic (pu501) which has been replaced now. All power rails seem to be working, nothing seems to be shorted on the board. It takes around 50mA from charger. I tried removing cmos battery and putting it back in. I'm considering flashing the bios via a usb programmer board, but that'll take a while to arrive. Is there anything I can try? Thanks.

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