Hi I've tried everything and still can't get my phone to turn on?
My phone was fully charged, and just randomly turned off. It will not turn back on, even while in charger and trying to hold down the side buttons
If your iPhone won't turn on, try putting it in Recovery Mode. You may be able to reset and update the device without erasing your data. The following support guide can help you with this: If your iPhone won't turn on or is frozen - Apple Support
If this doesn't work, contact Apple Support to set up service.