Getting past admin

I am trying to use some computers that I have from an old job. dell monitors. They’re powered via VGA box (I think its called?) and they turn on but then Im stuck at the admin screen. I don’t remember my old credentials & can’t bypass the admin logins. Anyone know how to get past this to be able to use them freely? Thx

submitted by /u/Equivalent-Diamond87
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from hacking: security in practice https://ift.tt/0YZxkez