Q: Mac Pro 10.7.5
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Jul 16, 2015 8:00 AMby The hatter,Try booting from another system., If you are running Etre you have reason to and anyone should have multiple bootable system or clone or create one. You may just need to do a clean install (time to buy SSD device if not already!) and build a new system and data drive.
No, the fact the program won't run doesn't tell anything. Bad download? bad disk? RAM or disk error? who knows...
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Jul 17, 2015 1:38 AMby lllaass,Try running Apple Hardware test
Using Apple Hardware Test - Apple Support
or Apple Diagnostics
https://support.apple.com/en-us/HT202731
which every is applicable to your model Mac
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Jul 22, 2015 8:20 AMby lllaass,What happens when you do this which in in the AHT link
Using Apple Hardware Test on computers with OS X v10.7 and earlier
AHT is located on the Applications Install Disc 2 and should be included with your computer or the MacBook Air Software Reinstall Drive on a MacBook Air (Late 2010). To start AHT on these computers make sure the Applications Install Disc 2 is inserted into the built-in optical drive, external Apple Superdrive, or for the MacBook Air (Late 2010) be sure the MacBook Air Software Reinstall Drive is inserted into a USB port. Then, follow steps 1-6 outlined in the previous section of this article.
