using 2 cores instead of 4 cores in CPU

[Carranza]

Tried going into bios setting to change my fan speed but all i did was restart my computer using only 2 cores with virtualization being disabled, what i did was restart my computer and while it was restarting i was pressing ESC key continuously and then pressing f10 or something too but the bios didnt boot up all I got from that was my cpu only using 2 cores instead of 4.

Tried going to msconfig and changing it to 4 cores in boot advance options but it did nothing . Can anyone help?

pc motherboard is a sunflower motherboard

EDIT: supposedly you can turn on vertualiztion in Bios advance settings, finally i got bios to boot up but theirs no option to turn on vertualization 

[Carranza]

downloaded something that would help me with my problem but it says im booting in EFI mode and im guessing that is my problem? not sure. but if so how do i get it back to normal 

[WAWood]

@Carranza 

Sorry -- but you don't!  Why? Because in HP PCs that come preloaded with Windows 10, that is loaded in UEFI mode -- and if you force the change to Legacy mode, Windows will no longer boot.

[Hibb1]

You won't have Virtualization as an option as that's only supported for Intel CPU's. Yours is AMD.

You usually can enable / disable hyper-threading in BIOS, but if you actually have a Ryzen 5 2400G then you should have 4 cores no hyper-threading and 8 cores with hyper-threading.

If you're only running 2 cores, then something weird has happened in Windows or you've got some serious problem with hardware.

I can't remember exactly where the hyper-threading option is .. Look for 'multi core support' in BIOS and make sure it's enabled.