Laptop problem. Please help!

[featurex]

Hello guys. So yesterday i reasembled my whole laptop and replaced thermal compound. After putting everything back in plate i started it and everything was OK. I started a game and after like 10 minutes it froze (definetly not overheating, temperatures were fine). After shutting laptop down manually and starting it afterwards strange things are happening. When i turn the laptop on, display is not showing anything unless i press ANY key on the keyboard, then i can see the display for like 1 second. View is not frozen, i can press any keys multiple times and see what is going on on the screen, if i try hard i can even use my mouse while pressing random keys on the keyboard. Maybe anyone has any idea what is happening? Thanks in advance

[Kemii]

Did you make sure that the connection between your monitor and your board was flush and all the pins connected?

[featurex]

Yes i did, it wasnt the first time i reassembled my laptop. Now i noticed that the screen is on at all times, but its very very dim. When i press any button on the keyboard it becomes bright for a second. I can see no connection here,,,

[Hugolich]

Can't you bring it to a repair shop and ask them to tell you what's wrong? (There are alot of shops that do it for free, thus asking).

[Indivision]

did you try turning it on and off???