I think the best answer would be depending on where you are personally located at.
If you're in the Russia, you would most probably be saying your PC is Female. If you're in Germany, you'd most probably be saying it's Male.
Why? Simple...
What does Russians call their homeland?
Answer: Motherland
What does Germans call their homeland?
Answer: Fatherland
Depending on where you are, that's how you define your PC. Male or Female. :P