We have all Asus mobos with AMD dual cores. One of them just started shutting down--not blue screen but turning hard off. Checked hardware monitors on bios screen and cpu just creeping up in temperature. Cpu fan running about 1475 (large fan; almost all of them run 1350-1500 and keep cpu about 35). This one starts about 45 and climbs slowly to 80+. One time 90. Replaced thermal paste, put in new additional case fan and that slowed down the climbing temp but didn't fix it. Climbs faster once past 70. Bios sensors show voltage seemingly steady. Have reset bios to defaults so no overclocking.