If you used the onboadr EPU switch, set it back to off.
You can try flashing the BIOS again. If you don't know which BIOS is is then you have two choices: Either use the latest .CAP UEFI, or use the last .ROM build (the one prior to .CAP) on the ASUS download page. Use USB BIOS flashback. Even if you are already on the latest build, reflashing may help if something is corrupt.