First time posting here but I've been using this site for malware detection and removal for quite a while. I have an Acer Aspire 3050 that I'm upgrading for my wife. I've installed Windows 7 Pro 64 bit and upgraded to 3GB of RAM. It had the Mobile Sempron 3500+ which I upgraded to a dual core Turion 64 x2 tL-58 yesterday. No problems installing it and it booted right up. I used it on and off for the rest of the afternoon. Then late last night I was moving some files from her old computer when it suddenly shut off. I thought at first the battery had run down but I didn't get an alert so I plugged in the power cord and restarted. As it was starting Windows there is a point where the CPU fan spins up and that seems to be when the power cuts out. So I was thinking that maybe it was over heating so I let it sit for about an hour until it was completely cool and tried again and it shut off at the same place again. I tried with battery only, power cord only, and power cord and battery, same problem. I did get it to boot once and was able to launch HWMonitor to look at the temps and everything was in the 50-60C range (except the HD). While it was running I streamed something from NetFlix and the temps did go up but leveled off at about 75C and ran that way for quite a while and didn't shut off. I shut it down but when I went back a little later and started it up it powered down at the same point as Window is starting the the fan spins up. So I took it apart again to make sure I didn't do something obvious like drop a screw in it or something and didn't find anything. I did pull the heat sink back off to check the thermal paste to make sure that was OK which it was. So I cleaned it up and reapplied thermal paste and put it back together. Same issue. I'm considering putting the old processor back in to see what happens. Any ideas?