advertising .. since it is PC repair ... national advertising is useless unless you are a HUGE repair shop ..
so local yellowpages .. web pages ... and of course .. MOST IMPORTANT ..word of mouth .......
Do some voluneeter at local tech show ... local trade show ... set up booth etc .. and ads in local news paper or tech .....
Most important .. get yourself an easy web address for people to remember ....
at the end ... once again .. word of mouth .... makes sure people recommended you .. either on speed .. or price .. or accuracy ... but a simple recommnedation from someone beats $$$$$ of advertising ...
