Will leaving the battery in during hardware replacement kill the motherboard and other components?

[2JJ1]

When replacing my laptops touch digitizer, I didn't bother taking out the battery since I figured nothing bad would happen if I didn't press the power button. Now the power wont start no matter what I do.

This thread suggests that the motherboard is the problem. http/www.tomsguide.com/answers/id-2994729/troubleshooting-power-issues-laptop.html Could it be that maybe I had power running, so the motherboard got shot? If this is the case,would it also kill the other components such as the RAM, hard drive, and battery? Please respond! I am trying to find out if I should buy the new parts or not. Thank you.

 

[rgd1101]

MERGED QUESTION
Question from 2JJ1 : "Laptop wont show any signs of power after digitizer replacement!"

Laptop: Toshiba Satellite p55t-a5118
I had a crack in the original digitizer so I replaced it for a new one. I switched it out but now my laptop won't turn on. I plug in the charger and the yellow light that indicates charging wouldn't show.

There are two I suspect:
*I didn't detatch the battery since I felt it would be unnecessary as long as I don't power on the laptop in the process of switching the screen. Is it possible that I have damaged some circuits? What are some signs I should search for?
*I yanked on this cord : http/www.ebay.com/itm/172338451789
That is the cord which connects to the power switch. Maybe it ripped. If the power switch cord is damaged, would that also stop the charge indication from showing?