Helpneeded

Hi, I have a similar problem. My Casio PX750 isn’t turning on as well. I checked the electricity multiple times and if the adapter was plugged in but it doesn’t seem to work. I don’t understand why as I have played on it 2 days ago and now it won’t turn on. I have tried to reset it with videos I saw on internet but they are not useful. Could someone please help me with this problem? Thanks in advance!