Can't Get the Screen to Power on

So here goes nothing. I've posted before a few weeks ago about some issues and came to the conclussion my logic board was irreparable. Long story short, I ended up getting a logic board of the same series from a 2010 Macbook pro to save some money. Right before my old logic board failed, I had installed new DDR3 Ram and a SSD. The new( to me) logic board came in and everything fit like a glove. Only problem is, I may have damaged the LCD screen cable. When I turn the macbook on, i hear the chime, and see the little light on the front. Then nothing. Thinking maybe it was a display problem, I bought a thunderbolt cable and hooked it up to my TV...Still nothing. I am new to all of this and never even owned a mac before this. I tried the whole "take your battery out and hold power for 30 seconds. I tried the Command C R P on start up, nothing. Any ideas?

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