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i have recorded what exactly happens with me

P.S, everything worked fine with ATI Radeon 4670 HD, this issue happened when i changed my VGA to 6670, and i got this issue with any version of ubuntu

Thanks in advance :)

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What is your Graphics card ? – Uri Herrera Aug 4 '12 at 17:28
ATI Radeon 6670 HD – Muhammad Mohsen Aug 4 '12 at 17:33
Have you Installed the proprietary drivers? if so, which ones? , which Ubuntu version? What have you tried? don't let information out of your question. – Uri Herrera Aug 4 '12 at 17:34
no i haven't installed any proprietary driver (how to do?) and i tried 11.10 and 12.4 versions – Muhammad Mohsen Aug 4 '12 at 17:38
up vote 1 down vote accepted

Welcome Muhammad

You could try editing the install options and change "quiet splash" with nomodeset, this should inhibit the installer loading a graphics driver which causes your problem. I'm not sure the details but I had to use this once when I installed ubuntu and you can find details in forums. It appears to be a bit of a dark art!

There is an alternative installer which I read is text base, Ive never used it perhaps someone can confirm this?

I found a similar problem here for boot but I assume it's driver problem and it should work too.

Ubuntu 11.10 and 12.04 Blackscreen on Boot

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nomodeset worked for me and i installed 12.4 but i have same issue when i try to open my ubuntu, what should i do after i the installation? – Muhammad Mohsen Aug 4 '12 at 23:24
i installed ATI driver and everything worked fine :) – Muhammad Mohsen Aug 4 '12 at 23:45

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