Help! (Toshiba satellite C55)

Aug 21, 2018
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Hi,
my screen recently broke and I’m having difficulty getting my laptop to boot as it has a bios password setup on it. I haven’t used it in a while so I’m also certain my dmos battery is now dead which means I would have to reset date and time before booting. I know the password, but when I enter it the laptop stays on for a while then Shuts down Even when I connect to a hdmi cord with an external screen, nothing. I know the hdmi port is perfectly functional but does not show as a result of the laptop not booting. Help!