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I decided to try and upgrade my old 2009 Mac Pro and update it based on the various guides that I've seen online. I figured the best 1st step would be to make sure that I flash it from 4.1 to 5.1, and if that works, I can purchase the rest of the hardware and do the upgrade.

The first time I tried doing this, it didn't work and supposedly it was due to me having a non-Apple graphics card. So I went and bought an ATI Radeon HD 4870. After installing it on the computer, it won't boot properly and when the main screen loads, it's all scrambled.

However, if I boot into recovery or safe mode- It'll work fine and the screen will be normal. Any Ideas?

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  • Hi, Ari welcome to Apple.SE! Please correct the title if I messed it up using edit button. – ankii Oct 16 '19 at 20:37
  • What OS do you have on there right now? – Tetsujin Oct 16 '19 at 22:58
  • It is running El Capitan 10.11.16 – Ari Milo Oct 18 '19 at 0:46

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