I have 3 Sonnet USB3
PCIe cards Installed in my new 2019. They were previously in my 2008 MP and worked like a dream providing 12 extra USB ports. Now after install the 2019 won't fully boot just stalling on a black Apple screen. I’ve been able to use the card in the very bottom slot but not the ones located in the upper slots. Trying to plug in a USB cable to these cards crashes the computer. Is it the way I have them installed? Asking the experts here.
Thank you!
