Unable to charge and to boot my MacBook after applying new thermal pas

Hello,

I disassembled my macbook to clean it for dust and apply new thermal paste.

Evertything was fine and I did it very carefully. But now I can't boot (I did it with the battery almost empty and the charge indicator works well and flash to indicate an empty battery) and the macbook didn't charge.

The indicator light on the magsafe charger doesn't glow...

Any idea how I should go with this?

I tried Shift+Crtl+Alt+Power Button to reset SMC. I don't know if ti's the good method but I didn't change anything...

Thanks in advance for your help