Hello. After replacing hdd with ssd mac pro 13 mid 2012 does not turn on, does not charge. Battery to be replaced?

Question

Solid State Drives

Before replacing the mas turned off and also turned off the battery (the question is why?). The warranty sticker is not damaged. Discs have been tested and are working. Is it possible to revive?

Answer 1

I'll try to knock out a wedge with a wedge - an unexpected answer to an unexpected question:
And if you put the hard drive back, does it start working?