hey guys i got a slight problem. a couple hrs ago i reformatted my computer and everything was done right.Then my friend was putting everything back together and he unplugged the harddrive. after that nothing would turn on but i could still hear the computer. i cannot get any sound keyboard monitor or mouse to work.But before when i unplugged the harddrive and plugged it back in everything was fine and now the second time i did it nothing will turn on. can anyone help me please?