There can be lot of bugs first it can be BIOS fault is that you turned on PC auto turnoff protection have you turned on the computer protection against overheating at very low degrees in the BIOS and it just turns off, or processor failure is because it`s too much is overclocked to much MHz for this type of CPU set by motherboard switch keys like I was have on my old PC as overclocking Spectrum Modulated sample will not work any example from the internet, but only on that what was been on motherboard printed, as in internet was been only one my model which one wasn`t worked by internet, as well as jumpers or BIOS overclock go as well can be wrong set in Thermo set, be sure that degrees is at least about 60 degrees in Celsius or your selected one but not like 40 degrees in Celsius, before it`s automatically turns off, I was tested it on my old PC and it worked good. There is homepage all you need your Official DRIVERS, for PC, BIOS, MANUAL:

Shuttle Global SN95G5
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And as well there is another tips, answers from myself, how to repair PC: Motherboard won boot up cpu fan comes on hdd
I guess that you have Gigabit motherboard after that you have Gigabit LAN, it`s high speed, as well there can be only MSI without Gigabit motherboard on NVIDIA nForce 3 ultra witch can be checked at site:
http://www.nvidia.com/content/motherboard_availability/us.asp
, to acces BIOS just Press key immediately, or at the following message: Press DEL or or simultaneously press , , keys to enter BIOS
As we can see in picture how looks like BIOS menu when it is turned in SETUP mode, now we just need to go with arrows to Load Fail-Safe Defaults and press enter then press F10 SAVE to CMOS and EXIT (Y/N)? Y press enter, after that just do this again with Load Optimized Defaults for performance, and then check that all voltage is set correctly to RAM and Video card(It`s AGP that means AGP slot not as PCI slot like some NVIDIA video cards), if no PC will completely not work, see in picture: as we can see default RAM voltage is 5V SBVIN to be worked it all after that go to PC Health Status to see how much is the real CPU temperature if it`s not after 100 degrees in Celsius all is fine wiThe PC starts but slmost immediately resets before - health-4cyml5j2fqseragbs510zyly-3-3.jpg alt="health-4cyml5j2fqseragbs510zyly-3-3.jpg" /> As wThe PC starts but slmost immediately resets before - temp-kzjazhersgenbex1ytech0vu-3-3.pngCPU Temp gag in PC Health Status tab see in picture:after all is finished just Save all BIOS configurations again and see what will happen I mean did it works.