Which PC ??? Some take a long time to go thru POST if BIOS has to check everything and configure itself. Any difference between cold BOOT (from power off), With power on and restart ? Most of the time it's "Memory training" (applying XMP) finding GPU or bootable disk.From when you push the power button to the screen shows the boot logo. If that takes 15 sec what could be wrong? PSU? GPU? Motherboard and CPU are both brand new.
Which PC ??? Some take a long time to go thru POST if BIOS has to check everything and configure itself. Any difference between cold BOOT (from power off), With power on and restart ? Most of the time it's "Memory training" (applying XMP) finding GPU or bootable disk.
If you turn Logo off you should be able to see steps it goes thru.
Most of new-ish MBs have Fast start/boot option in BIOS.