I have this problem for a while now, the rpi doesn't boot.
The red led is on but the green led never opens. I have formatted the SD card and re-install NOOBS on it but again I can't boot it. Before this problem appeared I opened and close the power supply because I wanted to fix the LCD that I have. I think I messed up the SD card reader. I tried most of the things I found on the internet nothing made it boot.
Will I need a new Raspberry Pi? If anyone has any suggestions I am happy to hear them.