Marcel Molendijk

Hi I think yhe best way is to just buy a new heatsink. I have an iMac 20" (2007). I found a heatsink for around 35 euro's (just look for one on Ebay (I looked for: imac 20" heatsink)) (including shipping, not sure about tax) So I will order this part... I think that differs a LOT in costs compared to new video card. So, before buying a new video card, check your heatsink like I did and save some money! Hope this will help someone someday...

Thanks for sharing this, I am pretty sure what the problem is. The heatpipes are (well, actually Were) filled with some kind of liquid. I took the whole iMac apart and at first cleaned all fans and heatinks. Also, I tested every one of them if they were working before assembling the system again. They all did. But, when I put everything together and booted, the temperature rose gradually until it was around 104 degrees Celsius. So, took everything apart again, and cleaned the heatsink processor and memory from the old thermal goo.. Applied silver paste and assembled. During aasembly, I saw some strange discolorations on my motherboard. Looked like some dried up liquid. After looking further, I also found discoloration on one of the heatpipes, but did not draw the right conclusion yet. Until I found this movie on youtube. https://www.youtube.com/watch?v=qXso8KFG... Then I was sure. The heatpipes have lost some kind of liquid and the discolorations were dried up liquid. Also, I did find the hole in the...