Why won't my laptop turn on after disassembling and reassembling it

I did a system restore in settings because my internet kept crashing and when it finished it never went passed the HP loading screen and then it would go black. It was like this for a few days and I tried everything to fix it Bios scan command prompt, system repair any type of troubleshooting you can think of I did. So after doing more research I came across a forum answer that said to disassemble the laptop take out the ac adapter and take out the battery for 1 minute thenhold the power button for 20 seconds and then plug in the ac adapter and press the power button. So I did this and when I put it back together it wouldn't work. Also 3 strips came out so I think that could be part of the problem as well. Can somebody please help me