My HP laptop has a "boot error" when it's turned on.
Recently, I had to take my computer to a shop because it had a problem that required Windows 10 to be re-installed. Ever since then, when turned on, it displayed a message on the bottom left saying "Press ESC to open start-up menu," and then, it would start loading Windows. Well, eventually, something similar to this happened that was just a black screen that happened after the message about the opening the Start menu. However, I was able to fix it by taking out the battery and putting it back in. But then after it was turned off, when I turned it back on, the "Boot error" happened, and I could not fix it by taking out the battery. I'm guessing this problem is caused by whatever is making it say "Press ESC to open Start Menu." I pressed ESC, and in the Start-up Menu it said that it was from HP, but it wasn't like that before, so, I think the shop might have installed something that shouldn't have been installed to my model of HP. Here is how the Start Menu looks like:
However, I don't know how to fix it and I can't figure out the model number but I do know it is a Pavilion. Please help!