Question Pc won't start

Jan 26, 2020
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When i started my Pc today, the Bios said "Overclocking Error, Press F1 to re-configure your system".
I pressed F1, changed a number in the AI tweaker settings, which i turned up a few weeks ago
(to overclock the PC from 3.4Ghz to 4.1 Ghz) to normal (from 105.00 to 100.00).
Then i restarted my PC and it showed nothing on the screen. I also heard no beep. Just the fans are spinning and lights are on.
What i also recognized was, that when I was changing the number, the Cpu fan spinned dangerously slow (150-200rpm normal: 350-500rpm)
What can i do?

Specs:
Cpu: i7-3770
Gpu: Gigabyte 1070 8G
Psu: Coolermaster M2 Silent Pro 620W
Mainboard: Asus p8z77-v pro
SSD an HDD: All unplugged
RAM: Gskill 2x 4GB

I hope you guys can help me.

Edit:
LOL the cmos battery was empty, now the pc works fine again
 
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