facing four problems at the time of booting

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http://askubuntu.com – Hi all I am not able to boot ubuntu i am facing four problems in serial please do help me to solve this i am stating each one below, 1) When I switch on my computer the ubuntu boots than at starting it says "the disk drive for /boot/uboot is not ready yet or not present" wait or press s to skip or m to add manually. 2)after pressing s than i go to login than once i login using my password than my honme screen pops a message "could not update ICEauthority file. /home/ user/.ICEauthority 3) then I press enter, than again a error message pops saying "there is a problem with the configuration s (HowTos)