SP Developers often run into issue where their deployed web part has problems, the page refuses to load. How can developer can remove those "bad" web parts from the page when the actual page does not load? The solution is simple enough, just add ?Contents=1 to the URL, it will take you to Web Part Maintenance page, where you can easily remove those bad guys
http://server/SitePages/Home.aspx?Contents=1 will take you to followng screen: