Startup problem after installing ubuntu 10.04

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http://www.ubuntux.org – Hi all, i am using dell inspiron 1545 laptop with intel C2D, RAM 3 GB. i have installed ubuntu 10.04 lypid lynx (LTS) using live CD. after this i upgraded the operating system using the update manager. i had restarted the system after update. the system hangs at the login screen. the system does not respond. the mouse also does not work. when i run the recovery mode the system hangs at different startup screen. i have used fedora 12 recovery mode to get back the essential data from ubuntu. Please tell how to solve this problem without making use of any other o.s. ? Thanks in advance, n729 (Distributions)