saiedahadi1,
Yes, a nice pair of khakis and a clean button shirt or polo like Dallas said - the key no matter what you wear is that you look good, clean and well groomed!!! Don't forget your shoes - they have got to be clean and neat and should be polished. No wierd jewlery, piercings, "blue hair" etc. you can be an individual at school - NOT WORK
Remember - it is Yes sir and No sir or yes mam and no mam not yea or nah - you would be shocked how people come in looking for jobs - hey dude, yo, got a job ?? This guy had ripped jeans, a tee shirt with who knows what on it and green spiked hair, he also had his skate board under his arm. If you are trying to get a job at a music store or a "head" shop - OK but not Best Buy, Office Depot or Verizon
As far as FIOS - trust me they would not expect you to be a fiber tech, if they like you, they will train you - A+ will tell them that you know enough about computers to do what they need you to do!!!
REMEMBER - ALL THEY CAN DO IS SAY NO !!!!!
At 19 - do not worry if you are quallified - just keep asking about jobs - you are a college student working his way through college - who knows you might find something you like and find yourself there 30 years later but just keep looking and asking EVERYONE!!
I would also suggest that you go to Borders or Barnes and Noble and read some books about interviewing, "dress for success" etc. - I did not say buy the books - just get a cup of coffee and sit down and read the books for tips, tricks and hints!!! You will see following up interviews with a letter thanking them and things like that - can NEVER hurt!!!
As far as a place like Best Buy or Office Depot and places like that - TAKE ANYTHING they offer to get in the door - you can always move to the "Geek Squad" or a better position once on the inside!!! I had a friend that was bagging at Publix Super Market, 3 years later he was a programmer for them in the corporate office making $25-$35 an hour!!! They paid most of his schooling!!!
Good luck!!
E.A. Broda
CCNA, CCDA, CCAI, Network +