Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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No display and 4th LED Not on


When i plug in my imac 1st led comes then after pressing power button i hear half chime sound (sometimes no sound at all). I can hear the drive spinning when i press power button. 2nd and 3rd led also stays on after starting the system. But 4th LED never turns on.


I was using my imac as normal and i felt it was working slow, alot of hard drive noise. I went out n came back and system was restarting. And it stayed on boot screen for 5 mins. I restarted it couple of times and it never went pass the boot screen. Eventually for 5th time the screen was completely gone.

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LED #4 means the Computer and LCD panel are communicating with each other... yours is not. You have a problem with the LED, possibly the inverter.

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