Please help.
MSI g41-P28,Core2duo 2,9GHZ,RAM 4GB,
Clover_v2.4k_r4411
ethernet kext using Yosemite kext, works
Audio using yosemite kext,works
Vga Nvidia GT420,kext using yosemite kext.works
screen 1290x1080,works,
GPU detected but screen flickers and can't shutdown.