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so i installed the red ring of death kit then used a heat gun over it and when i turned it on i had e74 so i re did it and still e74 but b4 i installed it i didnt get e74 just rrod any help?

Rrod can be several errors. In this case e74 is the graphic chip which is located behind the DVD drive. Go to www.llama.com and take a look at their guides. You’ll need to try and reflow that chip.