Problems reconnecting ssd x240

[cipu50]

Hallo! I'm new in this forum, my best thanks for every kind of help. Reconnecting the ssd in the case, after an upgrade, the x240 collapsed: by turning it on, signs of light, very weak, from three lamps, on-off, Fn and Mic, a soft noise in correspondance of the ssd, and no life! I bought the device second hand, it worked perfekt, the repalcement was done following the video of the Lenovo Service, I'm well experienced - but not perfekt! Is somebody in the mood to help me?

[RealBlackStuff]

Welcome to the Forum.
What did you upgrade?
Did you take the machine apart and put maybe a wrong screw in a wrong hole?
Forgot to connect something properly?
SSD upside down?
Bad power supply/socket?