so you cant see anything on the screen? do you know to flash the BIOS.if you know how do that for troubleshooting
flashing bios is not for troubleshooting ,updating bios is only recommended if the new bios info has a fix for a problem you are having ,not the problem you have right now .
maybe going into the bios/setup on bootup,usuall by hitting the f2 or f11/f12 on a dell laptop . and setting bios to defaults will help you now ,but don't try a Flash ,in my opinion