Q: Mac Pro crashes when loading into El Capitan

Try doing the  installation in Safe Mode

Restart holding the "shift" key.

(Expect it to take longer to start this way because it runs a directory check first. Also give it a little time after start because it runs some maintenance routines in the beginning.)

EDIT: Oops, my mistake you already tried that. The download could be corrupt, try a fresh download.

Karnveer wrote:

 

How would I do a fresh download on the Hard Drive?

Is there any way to save data?

The same way you did the original download? Not sure exactly what you mean.

Saving your data will depend on the way the app developed. Some store ll the data in the application and some store it in your ~/Library > Application Support. I'd save both the app and any files in Application Support.

To try to save data:

- Boot to Recovery

About OS X Recovery - Apple Support

and then use Terminal to try to copy date to an external disk

Copying Files to External Hard Drive via Terminal?

- Connect an external disk that has no data and then boot to Recovery and install OSX on that external drive. Then boot from the external drive and try to recover data via FInder.

If can't do via FInder then try a disk recovery tool:

Try a disk recovery app:

Top Ten Mac File Recovery Review 2015

http://www.cisdem.com/resource/mac-file-recovery-review-2015.html

you may be able to download a demo of Data Rescue 4, and the demo will give you an idea of what it can recover. If it looks promising, you then can buy the software.

http://www.prosofteng.com/products/data_rescue.php

My apologies I was replying more than one installation thread, and I answered for the problem in the other thread. lllaass is of course right about backing up all your data. Follow her good advice on backing up your files.

Do the same as my previous reply except boot from Snow Leopard install DVD vice Recovery