How do I restore lost layers? Layers disappeared; replaced by black background
URGENT. Working with PhotoShop CS6 on a Dell computer. I opened the file I was working on yesterday and all 45 layers are gone with just a black background layer with jumbled red pixels in a tiny line across the top. The file size is still the same, 426MB, but the last save date appears to be a month ago instead of yesterday. The computer shut down unexpectedly at some point yesterday while doing other things, so I don't know if this file was open at the time. Other psd files open fine.
Is there a way to restore the layers? Restore the last working session? Is there a hidden auto-save?
I cannot access the "isolation mode" spoken of in other posts.

