so What would I do?
Provide a lot more info.
What OS do you have?
What are your specs (RAM, video card, etc.)?
What protection programs do you have?
What do you mean by "nothing happens"? Does your computer not get any power at all?
When this happened, were you using the battery or was it plugged in?
Have you tried powering up with just the battery or by taking the battery out and plugging it into the wall?
Unfortunately, we're not magicians, so we need as much info as possible to avoid tons of guesswork.