Please ignore response #1. You haven't supplied any system specs or any details about your problem that would suggest a complete teardown or reinstall is necessary. Please supply your complete system specs & a detailed description of the problem. Your current question is like walking to into an auto repair shop & saying "my car won't start, what's wrong?", without even teliing the mechanic the year/make/model of the car.
I don't know why you would recommend a complete PC teardown or reinstallation of Windows without having any details about the problem? What if monitor is bad? Please wait until the OP supplies useful info before offering such extreme recommendations.