cumbriasteve
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Interesting..it is an Asus board, mate could be right about the paste then.Had the exact same issue with a couple of boards with a HD4200 on the northbridge (Asus board perchance?) - all it was was the heatsink had come loose and wasn't making full contact, so the northbridge was running hot, leading to beeps for temperature warnings, unstable operation and that rendering issue when the graphics core overheated. A reseat with new thermal paste and adhesive sorted one of them, but I also had one that seemed to have been damaged by the constant high temperatures (although, apparently that one had been doing it for months before they brought it to me....so...)