ubuntu 10.4.1 won't boot

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http://www.linuxquestions.org – so i downloaded the .iso file from the site extracted the file into a folder run wubi and reboot the pc when selected ubuntu it would go to the part hit esc if you wish to exit then would do a countdown the after 1 it will not do anything, the led on my monitor just keeps flashing and there is no display. i am running on windows xp sp3and tried installing ubuntu again, i have done this previously ( i installed karmic series ) and it worked fine, my pc crashed so i had reformatted so i thought i'd reinstall ubuntu but it didn't work this time... anyone might be able to help me why is this so (HowTos)