Macbook start-up problem fixed: flashing folder
At first I thought my hard drive was dead. After replacing the hard drive, the computer still wouldn't detect it. The problem must have been the cable connecting the hard drive to the motherboard. After replacing the cable, I could access my hard drive and my macbook could finally start up
It was fairly simple. Getting access to the mother board, carefully unattaching the cable and replacing it. Just being careful with the computer is a usual concern.