cleaned out dell 1720 but now screen won work

Hi

After taking my laptop apart to give it a good clean it powers up but nothing on the screen.

now theres a bunch of wires which poke through and 2 of them connect to the motherboard but i cant remember disconnecting the rest of the them.

its all i can think of unless there is anything obvious i could have missed the 2 rectangular ones under the keyboard are connected securely.Image may be NSFW.
Clik here to view.

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