Medion laptop start after CPU no more?

Yesterday I rudely overclocked the CPU of my Medion Erazer s x7855 since he goes though. But the screen stays off and about 30 sec. He automatically turns off again.

Unfortunately I do not come in BIOS

For solutions I would be very grateful.

That you would have shredded I would say.

One last attempt could be to open the laptop and take out the CMOS battery for 5 minutes. This will reset the settings and luckily everything will work again. Everything at your own risk.