Mac mini only boots after reset of PRAM
My mac mini keeps loading when starting up. Only when clearing the PRAM (by using the CMD + Option + P + R keys), it starts up normally.
I have already repaired the HD, then even erased the entire HD and re-installed the MacOS (through the recovery mode), but even after that the mac mini only starts up normally after reset of the PRAM.
Does anyone know what could be the problem?
Mac mini, macOS Mojave (10.14.1)