Their are a couple of different ways you can jump start your laptop. What it sounds like, the repair shop had changed the BIOS settings to power on with a different button. Their is more information [link|https://www.pcwebopaedia.com/laptops/info/how-to-turn-on-laptop-without-power-button/|here]. However, their is a way you can actually replace the power button and HP has an official repair guide that you can find [link|https://www.youtube.com/watch?v=QI2boMgN4I8|here].