Don't worry. The metal shavings are not a problem. I've had them on all 3 of the pc's I've owned. There's an old string on this forum that discussed this issue several years ago. Can't remember the exact cause, but it has something to do with residual shavings from the installation. Your mirror issue is fairly common, and the 2 set screws mentioned earlier are the problem/solution. Had the same thing happen on a pc I transported for the company, and on my 2nd pc. Minor issue easily solved.