How to find out if Bitcoin is running ANYWHERE on my laptop
By using ps and searching for processes named bitcoin:

ps aux | grep bitcoin | grep -v grep


The second grep just filters out the first grep which might under some conditions show up as well.
If you want to kill them just use the following:

for i in `ps aux | grep bitcoin | grep -v | awk '{print $2}'` do
  kill $i
done


This searches for running bitcoin processes, reduces them to the pid field and for each found pid it sends a kill.