Advertisement is relly needed or just a procedure??????

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Do really an advertisement can make a business valuation in the top position in the market??? By the profession I'm a hardware engeneer and normally i went to the customers home on the basis of call to repair or to rectify the problem's of their computer but i have no t.v or paper or banner advertisement of my work. How much people know me, they call me or they passout my contact no. to the other people if they need a man to rectify their computer problem. Through this i found work, but if i advertise my self as a man who repair and also sale computer then would it really help me?????????? is really an advertisement can help to spread out the business in the market????????