How do you get past it when you're finding it hard to write anything?

Over the past week, I've had several sessions when I'm sitting in front of my laptop, staring at an empty page and just can't write anything. It's so frustrating because I really want to write but don't know how to get passed this.

And it's not like I don't have ideas. I know the plot I want to write but the words escape me. If I try to force myself to write, it comes out so very uninspired. I need advice.