ubuntu 11.04 installation halts in loading after booting from dvd

[Mohas]

Hello
at first i'm sorry because my english is bad
I have a G62 notebook with ATI 5470 graphic card and I whant to install ubuntu 11.04
at first when I choose installation the screen become black."now it is solved"
I installed it from text mode but when I want to boot from grub at the same way the screen become black
when I want to install with nomodeset I see the loading but after 2 minutes loading stops
and after 5 minutes I understand installation halts
I know my ubuntu dvd is ok because I installed ubuntu in oracle virtualBox and it work properly.
my notebook is G62-a20se:
core i 3
ATI 5470
3GB DDR3 ram

why the installation loading halts?
please help me I tried alot:(

[pourjour]

me too i hace the same problem after showing the loading splash the screen become black
please help i want to installed using Wubi
ubuntu 11.04

[Mohas]

hello.
after of booting from cd/dvd .
in the first menu the installation ask your installation language.
select your language. and before selecting installation press F6.
in the shown menu choose "nomodeset" and press esc.
hope your problem solved.