I bought a new keyboard for the laptop and replaced it after putting all the components back the laptop won’t on it flashes the Alienware on button from green to red to light blue then bleeps

i checked ram one by one same issue 

got 2 16gb rams 

ssds remove and re insert 

but there is no video output to lcd I am thinking the gpu is dead my question is if the gpu is dead does this mean the machine won’t boot at all the motherboard has a built-in gpu but it won’t boot with the onboard gpu I am quite tired I have had so many issues with it I am giving up last hope someone can guide me it would be really great very frustrated  with the Area-51m R1.