PC restarts itself + can't flash BIOS (A REAL CHALLANGE)

[Giorgi]

OK, this has become real challange for me as I tried almost anything, now I am out of ideas...

The story:
It is my friend's old P3 comp, Runs on SOYO SY-7VBA133 mainboard, one small RAM stick, integrated everything, and small HDD.

The problem:
The PC was working perfectly untill now, then it suddenlly started restarting itself while in Windows... then it started to happen more frequently, then freezing during boot-up, and restarting and so on.

What I tried untill now:

1. formatting... restarts during set-up
2. Resetting BIOS with jumper and battery + removing cable - same problem
3. flashing BIOS - did not help, when I go to BIOS screen it shows same old version number of bios.
4. inspecting part-by-part - it says RAM, HDD are both OK.
5. Various things such as switching power to 220 Volts and back, cleaning fans etc, etc.

Now I am out of ideas and dont know why it still restarts itself and why I cant flas bios...

any suggestions? Thank you in advance

[fren]

Try to change your ram with the same speed. Where did you test your memory stick?

Have you tried to change the power supply?

[Giorgi]

Try to change your ram with the same speed. Where did you test your memory stick?

Have you tried to change the power supply?

1. I tested it on another machine
2. powe supply? you mean the cable or block itself?

[fren]

The power supply unit or box.

[fren]

What I mean is test your system with a known good power supply.