I. Latitude C, CP, CS series and Latitude L series:

After the Dell notebook enters the BiOS, press "Alt+F" to restore the original CMOS settings. If you hear a crisp "beep" sound after pressing the key combination, the operation is successful.

Second, Inspiron series notebooks (nspion 5000(e), Inspiron 2 100, Inspiron 2500)

):

After entering BIOS, press "F9" to restore the original CMOS settings.

Third, other Inspiron models:

Press Alt+F to restore the original CMOS settings. If you hear a crisp beep after pressing this key combination,

Sound, said the operation was successful.