Bom Shankar Everyone!

After install all kext for ati 3870 (msi rx3870 ddr4), a have blue with black screen and mouse cursor after MAC startup(logon screen). When boot with -x, in safemode, i see in "about this mac" thet video is ati 3800 series, device id is correct and bla bla bla.... I try use asus eah3870 result same, but on MB asus p5k pro with same kext all video work fine, on Intel D5400XS they work only in safemode... Who knows what the f*** and how fix it?