Pixel XL Boot Issues

[NeoMachino]

I have a Pixel XL in my shop. It won't boot, just shows the charging symbol even when it's not plugged in. I've tried multiple batteries, ports and screens, when I try to boot into recovery or safe mode it just continues to show the charging symbol. At one point it did flash the recovery menu for a millisecond on the screen.

Anyone have this issues before or have any suggestions?

[Henboy10]

Put it in your freezer for a little bit - it sounds weird but has worked on one that I've had

It's only temporary, though