General Question About BIOS and UEFI

"tb" <[email protected]>
Newsgroups alt.comp.hardware
Organization A noiseless patient Spider
Message-ID <[email protected]>
Newbie question...

If I were to purchase some kind of mainstream desktop PC without any OS
preinstalled and if I were to boot up such PC and press F2 repeatedly,
would I find myself in the BIOS screen or the UEFI screen?

Or maybe the UEFI screen is available only if Microsoft Windows is
installed?

-- 
tb
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