(DON'T READ) WHEN MY COMPUTER RE-STARTS ITSELF WITHOUT ANY COMMAND FROM ME AND WITHOUT WARNING TO ME, . . . . .

1. Over-Heated Processor
There are some fucking probability, they are :

• The Processor's fan is not operating/being operated optimally. May be it is tuck by thick dust
• In sandy or dusty environment, the cooling fin, under processor's cooling fan, may be filled by thick dust.
• Thermal Paste is absence. Thermal Paste is sticking Processor and the cooler part.

It is good for me to add another additional fan.
It is good for you to use CPU's temperature monitoring program like CPUID Hardware Monitor to be aware of over-heating.
2. My VGA Card is broken. Yeah, broken, real broken.
3. It should be my Power Supply getting old. Low quality thing getting older and then give up faster than the high quality one.
4. Not enough power supplied to Power Supply Sistem. Some Power Supply needs 480 Watt when some need 530 Watt, and there are other minimal supply of power needed by the Power Supply. Actually, it is not about the Power Supply, but it is about the input and output of your electricity to your computer. Old Power Supply often needs more power but put off far less power to your computer.
5. Broken RAM or bad RAM. Sometimes it is about the socket of the RAM.
6. This one is nightmare. HARDISK BAD SECTOR ! Oh, man, we got a seriously big damn problem if this happened. It won't be only about getting RE-STARTED suddenly, but also about your data.

Solution (may be) :
1. Buy and use good heat sink.
2. Buy and use good RAM.
3. Place your RAM in a good position in a goog place(socket).
4. If you buy a second hand computer, test it first ! Ask the owner about the condition of the processor.
5. Check your home/house electricity stability.
6. Fix your BIOS.
7. Don't use unsuitable, inharmonious, unbalanced combinations of hardwares and softwares into your computer.
8. Look at the capacitor ! Is it pregnant ? aarrgghh..!! 
9. VGA trouble. It can be its fan, the card itself, or the driver (look at number 7.). 
10. Don't use zombie, a half dead, RAM. Sometimes, don't expect RAM to be die hard. 
11. Bad power supply. It can be the cable, bro.
12. Too dry in some gears or fan. But don't lubricate them so wet so flood.
13. Check the capacitor with multimeter. 
14. Scan disk. 
15. Check disk. 
16. Change your electrolytic capacitor (elco). 
17. Change your power supply and power cable. 
18. Check your har disk cable. 
19. Don't use incompatible driver, software, and hardware. Watch out ! 'windows victim' 
20. Fatal error. May be it is vuris which also atack power system from the software to shut down the hardware ora to re-start the system.

I know that everybody who get broken computer don't want to re-install their computer.

Sekian dan terimakih para pembaca ! Mohon maaf kalau ada salah dan kalau ada yang kurang tolong diberitahu. Terimakasih.