need help with new computer (win 8 related maybe)

[pozi]

Hi all, we have in home a new computer with these specs:

i7-3770
ECS H61h2-lm3 motherboard
4 gb ddr3
500 GB
nvidia 620GT 1G ddr3
windows 8

ok so here is the problem:
the gt620 and hd4000 works fine and win 8 boot normally, but I want to put my old (but working) HD5770 1Gb DDR5 VaporX. When I install it, the system wont boot, the screen shows nothing.

in the BIOS there is an option named like "Select OS" where you can choose win8 or win7/others. When win7 selected the 5770 works fine but the OS dont boot, and when win 8 is selected we have the black screen problem.

so, what can we do? reinstall win 7 and forget about win 8?
there is something we can do in windows about the configuration?
thanks in advance

[noteworthynerd]

Moved to the computer forum, this doesn't really belong in build help.

[Cyanotical]

you need to uninstall the Nvidia drivers, and remove them entirely from your computer with a driver cleaner


this is fairly common, there is almost always issues when having both AMD and Nvidia GPU drivers on the same system