Why is my laptop not turning on when video cable is attached?

My HP Pavilion dv6700 works fine with external VGA monitor attached but when i connect 30 pin LCD flex cable (only cable without screen attached to it) power button lits up for a split second and then nothing. Same happens with screen and inverter at the other end. Could the cable be causing any issues or is it faulty motherboard?

Thanks in advance.

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