pinMode issue

Right so I am trying to make a bluetooth project that will turn on my computer using my android, but there is an issue; When I do like "pinMode(3,OUTPUT);" it will actually give out a tiny current that turns on my computer when I don't want it to, and Yes I did test out other pins and they all responded in the same way.

OK, thanks for letting us know.

We'd need to see how it's wired to make any comment here...

pinMode(3,OUTPUT); will make an output low, with 20 to 40mA of sink capability.
Did you need it high (5V) to be inactive instead? If so, try this in setup so it will be high when the output pin is turned on:

digitalWrite (3, HIGH);
pinMode(3,OUTPUT);