After I can't boot ubuntu when triple OS : windows 7, opensuse 11.4 and edubuntu 11.04, I decide to only one OS : ubuntu 11.04. The cases is same. I turn on my computer, then appear information about my motherboard (Asus P5KPL-AM). In this appearance, there is a message : Pres Del to run setup. After that, ubuntu logo appears. Then everything run normal. I can write, browse the internet, and so on. Then I turn off my computer.
The second, I turn on my computer. It runs normal too. Then I turn off my computer.
And the third, after the message (Press Del to run setup), the logo of ubuntu doesn't apear. The color in monitor is purple (the color of ubuntu, I think). After that, the monitor appear black screen. I can't type command in the keyboard, cause there is no appearance.
For a moment, I have installed opensuse 11.4. So that, I can work at home. But, when there is a solution in booting ubuntu, I will change my computer to ubuntu.
My computer system is in http://www.4shared.com/photo/wB1C_jLw/Screenshot.html
I type in the command line : lspci. It is in my attachment.
Thanks for your help.