pa help po paano po gagawin pag yung hp 640 g3 laptop is power on boot error enterning 3rd party option rom management error hindi po nya binoboot agad yung OS na nakainstall sakanya ??
if di ka nakaabot sa part na maghahanap ng OS si BIOS then nasa POST ka pa lang, tanggal muna battery sa BIOS para default muna, tanggal din yung ibang unnecessary devices
yes try to reset BIOS by removing cmos battery, you can also try removing the laptop battery and long pressing the power button for about 15-20 secs, kung alin ang mas madaling tanggalin sa dalawa,