The hard drive in my mothers computer died. Blue screen of death. So, i took the hard drive out of my computer and installed it. When i boot it up, it either goes to a black screen with a flashing white underscore, or it says "secondary hard disk drive 0 not found" The drive is fine, i think? It worked perfectly in my other computer. I have windows installed on it and everything. Its not new. What do i need to do to fix this?
These other 2 are completely correct, but you don't need to completely remove the first HDD from the equation. The BSOD doesn't mean the drive is dead, it just means the software is screwed up. Reinstall windows on that drive and use it.