Does it say "devices changed cpu or memory or cmos have been cleared" at startup?

Question

motherboards

When you start the assembled new computer (no OS), the following message appears:
Devices Changed (cpu or memory) or CMOS have been cleared. Please enter setup to configure your system.
Press F1 to run setup.
Press F2 to load default values ​​and continue

what does this mean??

Answer 1

The battery is dead (dead?).
Check the battery, replace the battery, and do not disconnect the computer from the mains until the replacement.

Answer 2

The computer is new, CMOS is not configured yet. Press F1 and configure, if, of course, you know how.