I opened my Blender file and I saw that in Cycles rendering mode the scene is blank even though there are lights in the scene.
To answer your comment with images... Change that 40k number to something that your PC can handle, like 1000 or something
Then go down to Children Click on Interpolated and add value 40 here:
I choose 40 because if you have Number set to 1000 and interpolated to 40, it basically means that every single 1 grass will be rendered as 40 strands of grass... (that means 1000 * 40 = 40000)... You can play with it better and even if you use something more complicated, you can use display amount 1 (that shows you how it looks in 3d viewport) and separate number for render amount that is only visible in renders...
When I tried to render it, it froze, so I went to very low numbers and set Number for Grass to 10... this is what your grass looks like in render: There are these weird strands making circles... I didn't understand why is it like this but I found the problem here:
I don't know why you put value like 6 here, it make base of your hair extremely wide, making these weird circles, and that's why it couldn't render, it took too many resources to render...
Now I add higher number to Number like 20 000: