So here I sit, with an XFX HD6870 that I swapped out the cooling on. Went from the stock cooler (noisy and not all that great), to an Arctic Cooling Accelero Extreme with the VR001 heatsink-set (quiet and very good). All fine and dandy...until I plugged it into the computer. There seems to be some sort of short on the card, because the comp won't even turn itself on when both power-cables are installed. And as you might know, running the card on one rail = no post, no image etc. Having tried most things, and already having written the card up as a loss due to my own stupidity, I decided to try something today, mainly to see if I could get the card running again in some form or function. First thing I checked was taking off the heatsink/fan assembly to see if I could find any sort of damage to the card hidden by it. Nothing found. Strangely enough, though, is that the testbox would fire up when the GPU heatsink/fan-assembly was NOT on the card. Still no image, but it looked like the rig did go through it's POST-sequence. The heatsinks for the RAM and VRM's are all glued on with thermal adhesive, but I noticed that the short and little spark came from the area where the VRM's are mounted (yep, there was a little spark ). Thus I figured that it was a good idea to remove the heatsinks to see if they caused the short between components. Not really an issue, since applying a little bit of pressure to the sinks made them pop right off. Here I made three discoveries: 1: The thermal glue, which I thought was a solid, hard mass, is actually more akin to the silicon sealant used by plumbers (I know, not the same at all ) 2: Between the VRM's, there's signs of damage on two small components 3: on the underside of the heatsinks, there's marks that looks like small scorchmarks in the aluminium. Now then! To questions: - Just how important is the cooling of the VRM's? - Could it be that the components that looks damaged has been the cause of the short? And if so, can they be replaced? See attached screenshot for a (poor) image of the component.