Still trying to access my broken computer screen!

I have a broken screen Acer Aspire E-15 with a garbled video image and when I hook it up to a Gateway HD Display Monitor HOMI , the Gateway screen will show exactly was on the Acer screen.  But a half-second later, the words 'Auto Processing - appear over the intact image from the Acer screen - so the connection has been made - but then the screen goes blank. 

And I have tried waiting, fiddling with buttons - but nothing works.  Suggestions?  

Also,  my only other monitor is a Panasonic LCD TC-26cx50 2005 with a Homi/ AVI 983790894 connection other than the standard one. Might that work – and what kind of cable would I need?  Thanks!