What to do black screen?

Question

Computers

Pulled out ssd m2 which was op. Hard remained. Put the ssd back in and black screen. Pulling out the battery from the mother did not help and does not work with 1 scarf of the RAM. SSD WD Green 128 GB.

Answer 1

Almost 100% sure that something is forgotten somewhere.
And you describe the problem poorly, what does a black screen mean? The computer turns on, everything is fine, but the monitor does not work? Please describe in detail at what point everything stops.