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I have imac 2006 17 inch was in it processor intel core 2 duo T5600 I replaced it with intel core 2 duo T6300 and imac turns on for 2 seconds and immediately turns off on the board there are 3 diodes first lights up and when I turn on imac the second one lights up but imac turns off and she goes out please help i don’t know what to do with it

I’m suspecting the CPU you’ve chosen it just not compatible! Apple never offered the T6300 in this series (or any iMac that I know of). This models graphics is held within the Intel North Bridge chip - Intergraded graphics engine (IG). Sadly, you can’t use any other CPU.