I have a Lenovo Ideapad flex 5-1570. On startup i get the blue error message saying boot failed and hard disk can’t be detected. I go into bios settings and see if legacy support is on and secure boot is off (had this problem before and fixed it that way) but the boot mode is locked on UEFI and grey. I have no idea how to unlock this and tried tampering with the settings to allow me to switch to legacy but nothing seems to work. I’m positive that my hard disk is working and cables are fine. Please help i need this for college. I’ve already tried taking out bios battery and then some;