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GPU Video Heatsink 730-0569 661-5315 with Sensor Original iMac 27 inch A1312 2009 for Radeon HD 4850 512 MB - used original spareparts for Macs
Reemplazo de la tarjeta gráfica del iMac Intel 27" (Finales 2009 o mediados 2010) - Guía de reparación iFixit
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macos - iMac 27'' late 2009 with GPU problems gets fixed by reinstalling Mac OS, what can be really happening? - Ask Different
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