What happens to my computer if i leave it on for a week?

I think nothing gonna happen, only the light bill go up.

Nothing will happen. Just mind the utility bills. Are you going to use it for mining or downloading?

A computer is designed to run constantly if I'm not mistaken?

Don't worry mate, nothing will happen to it. Except the electroicity.

Well it might overheat, i don't even leave mine on when i go out. No chance!

My computer is on constantly, I never really shut it off only time it gets turned off is if I need to do a restart for updates other then that its on mostly all of the time I haven't noticed any problems with leaving it on though.

Your electric bill will be higher but normally I leave mine on all the time as does the rest of my fam.

Nothing, if you don't have anything running. Well, also, if you have a good cooling system, then nothing will be exactly