This happens with certain monitors I've noticed with the game, check your cables between your settings are all firmly in place and replug everything in and it should fix itself eventually
While it's running, yes. It will not slow down you computer unless you are actively using it.
sometimes
No, it will not slow down your computer and no it will not give you virus
Shutting down a computer while downloading any software, games, videos, music, etc. may result in it not downloading properly. After rebooting the computer, try again.
Computers do not "seed".
And?
It's either your computer or your ISP
It was down a while back. It might be up again now.
No. Installing and playing games on a computer only slows it down while you are playing them.
Yes, Processing is done on youtube servers, Not your computer. You can safely shut it down without losing the video
if you mean on a computer, press 3 while holding down shift
if you mean on a computer, press 3 while holding down shift