Hi All! My 24 inch refurbushed imac computer that I bought from Apple recently, is not working at all. I press the power button in the back of the computer to start up the imac and nothing is going on the screen. I do not know anything about the hardware or software components of the Imac computer and before I contact an Apple technician, I would appreciate any advice on what to do with this situation. Thanks in advance for any help with this issue!.