Welcome, Newcomer. Please take a moment, if you haven't already, to work through the standard troubleshooting guide we have. This guide is designed for "no boot" and/or "no display" issues. The link to the guide is in my signature.
Note that toward the bottom of the troubleshooting guide, there is a link to jsc's breadbording guide. Breadboarding helps you find a short circuit problem within the case.