I just started building my barebones PC today, and when I press the power button there is absolutely no reaction. The only indication of any power is the indicator light on the board. No fans run, nothing. The power source is plugged in, so are the front panel connectors, and the only thing I can think of is the fact that I couldn't manage to install 2 of the MoBo screws, because they wouldn't reach the hole in the case. Any other problem it could possibly be?