I have an old Shuttle with AMD 3700+ cpu that i wanted to dust off and use as a test bed for trying different distro's. I wiped the hard drive of the ubuntu 10.04 it had and used Gparted to set 1 primary partition and 11 extended partitions in ext4, plus 1 swap partition on the extended partition. I installed my first test distro, mageia, and tested it, then added Fedora to sda5. Fedora was giving me some minor issues, and then the computer auto shut down. Investigating, I found the cpu cooler fan had quit working, so ordered another and replaced it. I also ordered more ram, and upgraded from 512 mb to 2 Gb of ram. The fan runs fine, but after about 2 hours of operation the temperature will be running about 65 C, then will spike and the computer auto shuts down. Also all subsequent attempts to install additional operating systems (5) have failed with various errors. Is my system now toast, or when it overheated is it likely that the thermal paste was damaged and need s replacing? Thanks for any suggestions or help.
edit: I say the temperature spikes, but I haven't actually seen any temperature readings when this occurs. I am guessing it is a heat spike because if I let it cool for a time, then it starts and will run another 2 hours.