While in traget disk mode to fix a black screen Macbook pro,  I trashed my boot from system library...oops - it trashed the working mac file and now I have no ability to open my trash to regain it... I do have an Imac, and connecting cable.

I trashed a system window boot file while in target disk mode: attempting to repair a black screen in macbook pro A,  it removed the file from working macbook pro B.  Now I can't open the trash to regain it.  I have an Imac, and can set up target disk mode, but am not sure where to go from here.. Help!

So, next I used Target mode...saw the HD icon on my IMac display and "loaded" Yosemite back onto the Macbook Pro, I thought, but no!  it loaded it onto my Imac -  so, had to wait til that was done to continue....next day...I decided to try command-R w/startup, recovery mode,  and use wifi to reload Yosemite onto my Macbook Pro, because I didn't want to go deeper into the issue - just wanted my computer working again.
That worked, of course. 
Thank you for your help - I always learn a lot on this site.

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