I have run a inverter APC 800va in the main line with a battery exite tubler IT 500. Then a 600 VA UPS before the power to CPU. Now when the power goes there is no problem at all but when the main supply come back then the problem occurs most of the time my PC re-start.
Thanks a lot for the answer.
My UPS is Proview 600 VA. And i do not have any software to look how the configuration is. I have change the Bius setting where it was "Stay off" after Ac Back, I have made the change "Power on". But steel the same result.