Laptop won't charge neither turn on

Hello, my name is Andrew.

I disassembled my laptop to clear the old thermal paste, reassembled it back, but laptop won’t turn on or charge.

Is it still possible to fix this?

Thank you for all answers and sorry for my bad english, I am czech.

FIXED, kind of..

the laptop was charging, but LED diods weren’t lighting. The problem is the cable or ribbon in the bottom near the keyboard cable. After lifting the the cable up, the laptop can be turned on, but nothing appears on the display and fan is not doing anything..