(Untouched) Invalid Memory Installed

My laptop was working fine until about two months ago when the screen started to not display anything but a black screen- the power light now blinks 5 white and two amber indicating invalid memory installed but i have not added anything or taken anything out, the most recent change i made was install an old printer driver to it. My laptop does not have an express tag— it has peeled off and i am unable to access the f12 bios screen. My keys light up byt my caps lock will not. Please help me!