Help please Proxima Ovation 814

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Hi there-
I just bought this panel from ebay for my classroom. I thought I could project off of my computer onto the screen for the kids. I bought a Proxima Ovation 814 from ebay. I thought it had all the cables but now I am not sure and the seller will not help me. I hooked it up the way I thought and when I powered up the panel said ovation 814 then the panel light started flashing freeze. I do not have anything plugged into the part that says serial/ADB because I was not sent anything. THe part that plugs into the panel looked like it was missing pins too. WHat is going on here and how can I get this to work?
 
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