latitude

hello everybody i have dell latitude 5520 I tried to open it to see the reference of the motherboard it had a password in the bios, I removed the ram and the battery, after I tried to restart is I fell on the problem of 3 blink orange 6 blink white and black screen, sometimes The screen flashes...

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Dell Latitude 5410/5510 and Dell Precision 3550 FDW50 LA-J381P BIOS DELL_LATITUDE_5510_COMPAL_LA-J381P photo