While i love uniq, it's not a solution here. OP said "I want to remove duplicate entries for one single instance of COMPUTER column." Not eliminate duplicate lines, which your uniq examples doe.
in reply to Re: Remove Duplicates!! Please Help
in thread Remove Duplicates!! Please Help
My first action after reading OP was to man uniq -- there's options to "avoid comparing the first N fields" and "avoid comparing the first N characters", but unfortunately neither of those work for comparing just the first column (of a tab-delim'd file).