Samsung flashes and vibrates but doesn't turn on after being dropped

My mother dropped her samsung phone accidently and it wouldn’t turn on so she told me to fix it, so I tried to restart the phone but it keeps flashing a vertical white bar while vibrating (which I’m assuming is the samsung logo opening) and it doesn’t turn on or off (and I tried going into recovery/safe mode, the thing that has all the small text on a black background? But that didn’t work either). It just keeps vibrating and flashing that logo at intervals. For now I have left it alone to charge so I can try and restart it later.

Personally, I think the screen inside the phone got damaged but I still want to try to fix it before handing it over to a professional, so I would really appreciate any help or suggestions on how to fix this, thank you!