laptop external monitor doesn't work

[astral kayak]

Hi, I recently updated my processor driver (amd a4-5000 apu with radeon hd graphics 1.50 ghz) and after that my computer doesn't detect the external monitor (I have an external monitor because the screen is dead) so I see nothing but I know that my laptop is turned on because there are sounds when a do something on the laptop. Please someone can help me

[eternal urchin]

you updated processor driver or graphics driver?