95% of the time on this model it's the GPU. Not getting anything on the external monitor would also indicate that. Although I would like you to confirm that your external rig works using another Mac. Due to the high failure rate of the card, prices remain high. I have had great success using a hot air station on this GPU. The equipment is costly but you could try a hot air gun on its highest setting to give it a shot.
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But before you go to this effort, please shine a flashlight at an angle to the screen and see if you can discern the desktop. If you can, forget everything I just told you and replace the inverter.
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But before you go to this effort, please shine a flashlight at an angle to the screen and see if you can discern the desktop (please have it booted up). If you can, forget everything I just told you and replace the inverter.
95% of the time on this model it's the GPU. Not getting anything on the external monitor would also indicate that. Although I would like you to confirm that your external rig works using another Mac. Due to the high failure rate of the card, prices remain high. I have had great success using a hot air station on this GPU. The equipment is costly but you could try a hot air gun on its highest setting to give it a shot.
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Here's how to access it: https://www.ifixit.com/Guide/iMac+Intel+20-Inch+EMC+2133+and+2210+Video+Card+Replacement/1014
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But before you go to this effort, please shine a flashlight at an angle to the screen and see if you can discern the desktop. If you can, forget everything I just told you and replace the inverter.
95% of the time on this model it's the GPU. Not getting anything on the external monitor would also indicate that. Although I would like you to confirm that your external rig works using another Mac. Due to the high failure rate of the card, prices remain high. I have had great success using a hot air station on this GPU. The equipment is costly but you could try a hot air gun on its highest setting to give it a shot.
+
Here's how to access it: https://www.ifixit.com/Guide/iMac+Intel+20-Inch+EMC+2133+and+2210+Video+Card+Replacement/1014
95% of the time on this model it's the GPU. Not getting anything on the external monitor would also indicate that. Although I would like you to confirm that your external rig works using another Mac. Due to the high failure rate of the card, prices remain high. I have had great success using a hot air station on this GPU. The equipment is costly but you could try a hot air gun on its highest setting to give it a shot.
[product|IF317-011]