MacBook Pro 2010 fails to boot
Macbook Pro 2010 running High Sierra has operated reliably for years, now refuses boot up correctly. On power up the screen does not display the Apple symbol and the horizontal boot progress bar. Instead the display progresses from a blank black screen to a white screen with a centrally located folder with a ? symbol in it. This does not change until the device is de-powered. Does anyone know what the folder icon screen with a ? inside it means during boot up. How can it be fixed?
MacBook Pro 15″, macOS 10.13