MedionPC is the OEM, they usually don't advertise the motherboard brand.
D/L: SIW - System Information for Windows
This will tell you everything about your computer, post the motherboard manufacturer and revision number here.
"Select 'Fox Central Control Unit'" tells me it might be a Foxcon motherboard.
With some info on it we can find the manual.
Your BIOS is American Megatrends, it will depend on how they set it up.