ReServer user here. I have my system BIOS power on set to power up if power was lost. It works most of the times but not always. Why? Is there a fix for this?
If your CMOS/RTC battery is weak or dead, BIOS settings (including the power-on option) may not persist properly or reset after a full power drain.
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@ahsrabrifat I believe BIOS settings arekept. After such event (power down and not starting up when power up) it correctly restarts several times till again after few electricity shortage events it would not power up again.
Hi there,
Captain , Obvious checking in here… Is this plugged into a grounded outlet? or a 2 wire power cord?
HTH
GL 
PJ 
Hi, I believed it is grounded. How does this influences auto start feature of BIOS? And why it is starting back most of times but just one of many it is not stating back when power is back in the house? Thank you!
Hi there,
Definitely Strange behavior forsure. Seem like a bad cap or something in the power-on segment. Improperly grounded outlet can cause ground loops and precharge a capacitor used to switch on the power ready signal. I have had this on a Touch sensitive device on a MMI unit in the fab when temporary power was setup for installation of a new machine. Intermittent IG was the culprit.
HTH
GL PJ
Sounds like it is time for a UPS if its mission critical. 