The red circle is called a power supply. You may be able to pick a used one up if you are lucky. The blue circled object is a switching power supply. It looks like someone bypassed your regular PS and installed the switcher. Have you tried checking the AC input power by setting your meter to read AC and placing the leads on the two AC input connectors? If there is still no power check to make sure the white interlock switches are all closed. Most can just be pulled out in order to lock closed.