i have a big problem for me, if you can help me i thank you

i have Z68AP-D3 mobo and Geforce GT630 graphic card

installed lion, i have 2 apple cinema display 24, (not mini display)

but i cant use DVI port, only vga and hdmi

when i write GE:no. system is opening but G:yes not opening

so i wanted to install new system with use DVI port

but when i want to install appering white screen and doesnt continue. if i write GE:no apple logo appearing but doesnt continue and freezing

so if i install with vga or hdmi what must i do / install, after install lion my pc

can you help me, if possible.