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Released in 2009, the Dell OptiPlex 780 Small Form Factor is a mini-desktop computer in Dell's OptiPlex 780 lineup. Identified by the model number DCCY1F.

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Why asks system password when it is on?

When my pc is power on it asks system passward

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It's likely a BIOS or UEFI password prompt, and this is a security feature designed to prevent unauthorized access to your computer's basic settings and functions. If that is the case and you don't know the password, you may have to reset the BIOS/UEFI settings. You can do that by removing the CMOS battery

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