The computer will turn on but the display has no picture or color The boot chime the fan and hard drive activity can be

How Check Internal Power For Imac

Check if the computer is sleeping. Press the space bar to wake the computer from sleep mode. 2. Did the computer wake from sleep Yes Put the computer to sleep from the Apple menu and wake the computer again to test the settings. Check Energy Saver setting to see when the computer has been designated to sleep. 3. Reset your computer's PRAM Parameter RAM . If your iMac is on, turn it off by pressing the power button in until the computer powers off. You should hear the drives and fans go...