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Model A1174 with 2 GHz Core Duo or Model A1207 with 2.16 or 2.33 GHz Core 2 Duo

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Do I need a Video Card replacement?

I replaced the power supply a year ago. All has been generally well since then. For the past 2 years, if my wife turned up the brightness above anything but the minimum setting for the display, the machine would freeze. If we kept the brightness as low as it will go, the machine would do fine. Until we went on summer vacation in late July this summer and came back to the machine frozen on the desktop background picture of our family without anything showing up on the desk top. I rebooted. Same thing. I let it cool down for a few hours unplugged. It booted up and then got locked on the desktop but this time with all of the icons present on the desktop. That means that if it were strictly a fan or heat issue, that it took less than 2 minutes to overheat and lock up. I took my wife's hair dryer on the cool setting to blow cool air through the fan inlet. I was able to reboot and use the internet for 5 minutes successfully, but then it locked up again. Do I need to replace the video card? Is that even an option?

Many thanks!

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what are the last four digits of your computers serial number? that will allow us to properly identify your iMac.

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christian, right now it definitely sounds like an overheating issue. You do want to open it up and take a look around to see anything obvious. Pay particular attention to the capacitors. Check for any leakage of domed caps. Use these guides to work on your Mac. also, pay attetnion to your inverter and see if anything looks out of place, molten, deformed etc. You can also check the diagnostic LED's :"

Diagnostic LEDs

The iMac has built-in diagnostic LEDs on the main logic board that can help you to

troubleshoot the computer. The LEDs are located to the right of the battery (see photo below).

LED #1

Indicates the trickle voltage from the power supply has been detected by the logic board. This LED will remain ON whenever the iMac is connected to a working AC power source. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power source is disconnected or the power supply is faulty.

LED #2

Indicates the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.

LED #3

Note: This LED is not used on systems that have integrated graphics, which includes all configurations of the iMac (20-inch, Early/Mid 2009).

LED #4

Indicates the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.

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