I am running a Tobisha Satellite L855 series. I am using both a keyboard and mouse that is external. However, even then I cannot hold down the left mouse button while I type or press a key on the external keyboard. I am running windows ten on the system (it works fairly well) and I have no clue how to fix it. It seems the internet in general has no clue either since I have been looking for a problem related to mine, only to find my problem appears to be completely unique. If I can get a solution to this, it would make my job a lot easier.