Screen flicker boot up problem

[Mushahid12]

I recently installed Ubuntu 12.10 64 bit version on my Toshiba Satellite with AMD Radeon dual graphics alongside windows 8 and whenever it boots up it first stops at the purple screen for about 20 seconds then starts to madly flicker between bits of writing and the Ubuntu boot logo and after a long time it finally stops and then Ubuntu boots up. I don't know what is happening but i gave the same disk that i used to my friend and his one works fine. My video graphics are fully updated as well.

[Locus Kiesselbachi]

Hello!
Im trying to find people who might have similar problems with OS, as I have.
You say "starts to madly flicker between bits of writing".
I have also a boot problem, but finally OS also loads. It wouldnt say it flickers. Altough we have different computers, may it still be even little similar to my problem? Toshiba Satellite has many variations!
I added photos also:
http://ubuntuforums.org/showthread.p...3#post12503793