PS5 Error FFFFFFFF

FFFFFFFF Error Code

FFFFFFFF doesn't really need to be explained at all. This code basically means there are no errors reported by UART. Usually either the issue is caused by something not monitored by UART, or the error codes have recently been cleared using:

errlog clear

Try power cycling the console and check for errors again. If you get a beep but no light the first time, that's just the console resetting the power rails. Power cycle it a couple of times...