Speedfan Readings for detecting shut down issue

Jun 10, 2014
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Hello everyone,
Well, my old desktop pc shuts down randomly. I think it doesnt shut down in idle mood, but i am sure it shuts down even with simple fb applications. Weirdest thing, it never shut down using heavy software like photoshop or autocad. I guess it is my PSU or CPU (?) but i can't really tell. I downloaded speedfan to try to find out the reason.

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The time of these readings, only google chrome was working (about 8 tabs -utube, fb, hotmail, and the rest were simple tech-forums)

Additionally, the last time my pc shut down, temp2 was about 100C. I don't really know what temp2 is, i googled it and it may be the north bridge which would mean that i need a new motherboard... This temperature happened after starting a stress testing software. That time, i tried to print screen, but by the time i opened "paint" pc shut down...

Any thoughts?
Thanks in advance!

Specs:
CPU: Intel Core2duo 6600 2.40Ghz
Memory: 4gb Ram
GPU: Nvidia Geforce GT 240
Motherboard: Gigabyte GA-965P-S3