I haven't really had any issues since I resetted CMOS. I also installed LED stripes again and that didn't make any difference. I guess motherboard's overvoltage protector was too aggressive or there was some kind of electrical problem.
There is actually a fault current protection and over voltage protection in the electrical cabinet. Unfortunately I only have grounded outlets in the bathroom and kitchen. Also the last power outage I remember was like 5 years ago during a heavy thunderstorm so I'm not very worried about them...
There is a pretty new extension cord between the ungrounded outlet and the PC. I live in an old house but it's in the city center so there shouldn't be any power issues and outages.
I don't know if it's just coincide but my PC failed to boot after installing led stripes. They were connected...
Resetting the CMOS with button wasn't enough. I disabled the overvoltage protection by completely removing CMOS battery and my PC is running again. I wonder what triggered that protection. Could it be chinese led stripes which I installed today? They are only connected to the PSU though.
Some weeks ago my PC didn't want to turn on at the first attempt. Screen went black and all fans started spinning very loud. Today nothing happened when I pressed the power button and I noticed overvoltage led on the motherboard.
I tested PSU with paperclip and it turned on and so did HDD, DVD...
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