Aser nitro stopped working


I was changing the extra HDD drive in my brother’s laptop (Aser Nitro 5) and when I gone to turn back on the pc after changing the drive it never booted up.

I’m not sure what the issue is because I have done this repair multiple times on his laptop.

There might be something I’m just overlooking but I’m not sure.

Any help is appreciated.
Thank you,
Struan Mclean