So basically I have a Mac Pro 2.1 8 core 32gb ram. I've spent months trying to upgrade to Yosemite using SFOTT and other various software to no avail. I gave in and bought one of those SSD's on eBay which have El Capitan pre installed especially for the old macs. I've plugged the new SSD in and it booted up to El Capitan perfectly! The only issue is I cannot login because the mouse and keyboard doesn't seem to be recognised. I've done a PRAM reset and have tried unplugging everything and leaving it for about 5 minutes. The mouse and keyboard works fine on startup and in my 10.10 install, it's just El Capitan that I'm having trouble with. Is there something I was meant to do?