Comment 27 for bug 1867092

i have this problem on a 17" Macbook Pro 4,1 from 2008. until recently, with nvidia drivers installed, both Ubuntu and MX Linux performed very well, now i can get anything on this computer to boot except mac os and i can't even get an official mac os install dvd to boot, nor a techtool pro 4 which i found in an old cd wallet to try to fix problems. i never really used anything but Ubuntu since around 2009, and it's still running 10.6 snow leopard.