I have had a problem with my system overheating for as long as Ive owned it. I blow it out for dust almost daily (its a habit now), all my fans are working, I have replaced the stock thermal paste with arctic silver once myself and once by the local computer store. My system specs; Gigabyte k8nf-9 v2 mobo AMD Athalon 64 3200+ AMD ATHLON64 certified CPU fan & heatsink Nvidia Geforce 7800GT 256 mb 16x pci-e NZXT PF-500 500Watt Power Supply 2Gb Corsair Value Select Dual Channel ddr Aspire X-Navigator Aluminum ATX Mid-Tower Case I had an extra fan mounted to the northbridge sink because the guy at the local shop noticed how hot it ran but unfortunatly this didnt fix the problem. I took a couple screens of speedfan at idle and again after a short while of gaming. I had to stop gaming quickly to catch the temp as close to failure as I could. https://www.techspot.com/vb/attachment.php?attachmentid=22092&stc=1&d=1189654518 idle temp.JPG https://www.techspot.com/vb/attachment.php?attachmentid=22093&stc=1&d=1189654518 gaming temp.JPG As soon as the one listed as core gets to 120 my whole system shuts down. I also run Core Temp 0.95 and It lists only one temp and it is always the same as the one listed as core. The only way I can play my game is to sit the system on top of the A/C vent in the floor with the a/c unit running. My problem now is that its getting cooler outside and the a/c isnt running as much so I crash alot sooner and more often. Please, any help would be apreciated.