Go to BIOS settings and look under Power for AC Power resume - or similar and set it to always off. This should give you the chance to plug in PC and switch it on using power button.
Do you get any beeps from PC as it starts?
OnePlus 6 review: Hands-on
How to add texture to hand-drawn artworks
Best free iPad apps 2018
Comment créer un compte PayPal pour payer en ligne ?