I think you have to have leopard installed before you can install snow leopard. Update: When the computer restarted with the snow leopard disc in it, it installed snow leopard. It says, 'Clean the disc and try again.' It is a new Snow Leopard disc! I want to know if I can put el capitan on a flash drive and boot from it to install el capitan. Update: I have installed Leopard 10.5(Not to be confused with Snow Leopard 10.6). I had to backup my files because I wanted to do a clean install. It said'Install Failed: could not copy the necessary files'. So, yes I have already tried reinstalling macOS. Maybe you mean the recovery mode on the cd. The computer came with the snow leopard cd. It had El Capitan then Mojave installed on it so I wonder if that could be an issue too.Ĭlick to expand.It is not outdated. That could be a problem, but I don't know. Then, I tried an extended test and it said, 'Alert! Apple Hardware Test has detected an error: 4MOT/3/40000004 HDD-1408' I searched it up and sites said it is a hard drive fan error. I booted from it and started a regular test. I noticed I had a Leopard installation cd with Apple Diagnostics on it. I wanted to make sure it was before buying anything else. I tried again with the new cd and it said the same thing after a while. I thought it was the cd so we bought a new Snow Leopard installation disc. Later, I came back to check on it, and it said Install Failed: 'Could not copy the necessary files'. I started the installation of snow leopard. I booted the mac to the cd with the hdd in it. I got the files off and formatted it to HFS. I connected the hard drive to another computer. Then, I decided that we should just take the physical hard drive out. I tried to copy some of the important files to a flash drive using terminal, but the flash drive could not mount. I thought we should format the hard drive and do a clean install. When it finished it said it appeared to be okay. I tried to run disk utility to check if there were problems with the hard drive. So, I tried to boot up from the original Mac OS X Snow Leopard installation disc that came with it. I waited and waited for it to boot up it just would not boot up. I shut it down and tried to start it up again. When it did finally become a full bar it did not boot up, it just stayed there. When I tried to boot it up the bar took forever to go accross the screen.

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