A12 Screen wont turn on but it vibrates

My phone screen had recently broken so I purchased a replacement screen and had to take out and put back the entire phone (as I mistakenly got one without the frame) after it did turn on and was working, however, I noticed that the selfie camera was blurry so opened it up again to investigate, after that, I put the covers back and now it won't turn on, however, I can feel very often vibrations upon holding the power button. I have already tried to do resets, hold down the volume buttons, etc. Any help will be greatly appreciated