Trying to fix my mother‘s iPhone SE. It is not booting up at all and just keeps flashing the Apple logo intermittently. I have tried the volume up and down and side button combinations but nothing happens.

There was a notification on the black screen for system, restore, and an icon to plug into the computer so I tempted to restore over iTunes but now it is literally stuck on the screen, and I can’t do anything to escape it.

Any tips?