Help Optiplex 3010

Hi, today i was trying to fix a fan error of this dell optiplex 3010 the error code was 2000-0510 reading in the support board that was an error that coul be fixed just updating the BIOS, so i downloaded the bios(the right one of course) then i updated the bios of the pc the update was aparently OK because the process was running with normality until the end so when it was completed the pc will be restarted but after the restart i just got black screen over hdmi and vga. i tried pulling off the cmos battery but after that still got black screen.
thanks in advance and sorry for my english