When I open My Photoshop file, it's messed up. Some green color like a printer run out of color. Can I repair it?

First thought is to look at the Channels Panel. Are all channels selected or is it one or two?  RGB should all be visible.

Layers Panel: Make sure all your layers are in order and have the proper blend modes.

If that is not the case,

Here is a PSD recovery Utility:

Telegraphics - Free plugins for Photoshop & Illustrator...and other software

If this does not help,

The other thing I would look at is recovering a past copy.

Shadow Explorer if you are on Windows and your file is kept on a C: or D: drive and Time Machine if you own a Mac.

Gene