after changing my video card to amd hd 6570 it's not possible to install Ubuntu anymore
On windows (8), everything is just fine. my new video card works perfectly and I have no problem with anything about it.
then when I try to boot from ubuntu (or any other Linux) to install it with wubi or with usb everything goes like this:
1) Grub screen...no problem at all, colors are just fine everything looks okay
2) and then Ubuntu's boot screen...weird background color, over the backround there are vertical stripes of red-orange dots.
3) desktop is about to start but * vertical stripes of red colored dots are all over the unity screen*. then when I click on ubuntu's menu, it usually switches to black screen saying something about "panic occured"...and then it restarts or it gives no respond at all.
problems started after I started using amd hd 6570 video card on my asus m5a78lm-lx mainboard which has amd phenom II X4 processor on it.
again, I'm writing on Windows 8 right now and everything works and looks perfect. so far I've only updated bios.
on virtual box Ubuntu works fine.