Question Fan starts working without pressing Power button

[Sipno]

Hello Community,

Laptop: Dell Vostro 15 3568
I have an interesting issue on my laptop. When I connect it directly on electricity, without the battery on it and without pressing the power button, the fan starts working fast for few seconds. Then stops and the laptop starts working, without having pressed the power button. I receive an error from bios regarding the time that set on laptop so I thought it's the battery of my motherboard. If the laptop is on electricity and it's closed, then the boot is done corectly.

I cleaned everything but the problem is probably on the battery of the motherboard. Does it change? Do you think that's the issue?

 

[Mr.Spock]

yes the CMOS battery is probably dead

you can replace it, google Dell Vostro 15 3568 CMOS battery and there should be plenty of info