[ubuntu] Freeze at boot

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http://ubuntuforums.org – Hi, I installed Ubuntu 11.10 64 on a HP Z210 workstation (i7 2600 CPU, NVidia Quadro 2000). I had trouble starting the installation process or any item from grub menu as whatever I selected, I got a frozen black screen. I managed to install by adding the nomodeset parameter to the grub item command line using the manual mode (pressing 'e' on grub screen, modifying the command line by adding 'nomodeset', and pressing F10). The installation was fine but now the computer won't boot. It freezes on a black screen with a blinking cursor. I guess there is still a problem with the graphic card. Is the (Hardware)