[ubuntu] Unable to get past the purple blank screen on my HP 450 Laptop

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http://ubuntuforums.org – Dear Experts, Huh! Apologies for creating a new thread. I'm new to Ubuntu ( though I'm familiar with Linus/Solaris). This is the third day and I'm still unable to install ubuntu 12.04 nor 12.10. I searched in the ubuntu forums and found suggestions to use 'nomodeset'. However, after specifying nomodeset as per suggestions, I could only get a purple colored blank screen only (without nomodeset, its freezing at black screen). Could someone please suggest what else needs to be done or am I missing something? My laptop configuration is : Intel Core i3 processor and features 2 GB DDR3 RAM, 50 (Hardware)