I have no issue with the text or the layout.
1, The thing I wonder about is the illustration.
Im not sure why but there's kind of a theme in pc repair ads to depict end users as 'befuddled'. In this instance there's an image of a guy looking pretty foolish, in accordance with thinking along the lines that people must need our services because they are technically inept. (or something like that)
I guess the successfulness of your flier, then, will be about whether your target market identifies with this image.
2, Fliers are notoriously difficult things to get a decent return on. While I can see the reasoning behind "this is what we do... phone us", I think that a more successful strategy would be to dangle a golden carrot and make that the impetus for the phone call.
You're saying, "we do this, phone us" (inference: sometime, whenever, if you need it)
Im saying you might want to consider "if you phone us NOW you get THIS" (inference: if you wait you will miss out).
"THIS" being something that will motivate them to pick up and phone YOU, NOW, rather than do nothing; wait till there's a computer problem, and then go the route of their existing repair service.
3. The thing I am missing on your flier is your logo. Its a very powerful image, and I think it says a lot about your service in-and-of-itself. Also making the connection between your business and the ad (brand recognition) is an important aspect of building consumer knowledge about you. Basically the more exposure people get to your brand, the more likely they are to use you . At the moment there's nothing on the flier achieving that task.
Just my 5c