Hi guys, I'm here to ask for your advice

Yesterday I opened the Nitro 5 i5 8300H notebook and added an SSD M2 Adata 250GB, and I installed windows 10 and everything worked perfectly. But in some benchmarks I realized that temperatures were very high 95C in 3D Mark etc ... So today I decided to reopen the notebook to replace the thermal paste with Artic MX4 on the cpu and gpu. I performed the procedure without any particular problems. But when I reassembled everything, the PC doesn't turn on anymore. Without charger sometimes flashes but does not start. With the charger the light stays on, but the PC does not turn on. I have already tried to reset the battery and reopen the laptop to disconnect the internal battery, but I got nothing. Do you have any advice for this?
Thank you.