Tried downgrading to windows 7 from 10 on an asus x555lab. I changed boot bio to boot from disk drive. Via enabling csm. When i tried to install it said there was not enough room on disc. So i decided to just stay with 10. When i restarted it, it went to bios again so i changed the csm to disabled and re enabled secure boot saved and exited. When it came back up it sent me back to boot bios. The only start up option is hdd but every time i try using it to boot it always sends me to boot bios. I even tried to set everything to default and it hasn't worked. I need help to get it back to a normal start up from the hdd.