Hey guys. I kind of accidentally changed my laptop setting from UEFI to LEGACY while I was looking for ways to lower my fan speed in the BIOS. Once my laptop rebooted, I cant do anything. It only shows the same message over and over again. "OS not found. Media test failure. Check cable". They said that I should try to open the BIOS using F2 but it doesnt work. I even tried repeatedly tapping it like I was playing DBZBT3 on the PS2 but no luck. Please help.