My Macbook Pro suddenly stopped booting up properly. The following images are the images of the boot logs of the normal bootup and my bootup. I kind of know that it's not a hard drive problem because when I put my hard drive into a functional Macbook Pro, it booted up perfectly fine.
The difference in between these images are that in the normal boot up process, you'll see "BTCOEXIST off" text, but in my bootup log, it never reaches that line. If I don't boot up in verbose mode, I get a prohibited sign instead of Apple logo during the boot up.
I've already reset the PRAM and NVRAM and also nothing else is connect to it.