This happened to me short time ago - the PSU had gone.
A quick sniff of the player will confirm this, with a smell of burnt insulation.

If you get high sniffing the player, you'll also know someone's been cutting 'blow' on the glass top...

System 1:
568.2MM, G98DH, Denon DVD-A1, UHD722, D5KC, D5500.2K, DSP33, Sony UDP-800, AppleTV 4K, Sony KE85XH9096BU

System 2:
562V, M20, AppleTV

System 3
501, 555, AppleTV, Acoustic Energy AE1