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Ubuntu12.04 boots to black screen on old desktop

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http://askubuntu.com – i try to install ubuntu 12.04.1 on an old desktop computer. it took a long time to install but it completed installation and it messaged to restart for boot.(the installation was in the graphical mode). -installed with install parameters after unsuccessfull trials with no parameters trials: noapic nolapic all_generic_ide nomodeset (of inclusion of last one i am not sure) every time i start the computer it showed the ubuntu loading image but in a crippled way. it was very small and just at the some rectangular fraction of the screen and rest screen was black. this happens in a very short time t (HowTos)