Can i open my computer while it is already on?

[babachicken]

yeah the question is self explanatory

 

[Nuno Silva]

Open, yes, touch no

 

[Specops125]

You mean the case? Yes, just better to not be moving it while it's on, and don't touch thing's inside aside from the coated wiring, and don't plug stuff in/out on the internal components.

 

[rgd1101]

shut down only take seconds.

 

[babachicken]

i want to see whether my CPU fan is working at all....

 

[rgd1101]

shut down. open the computer. turn it on.
It probably took long for you to get a response here then do that.