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Bad LCD?

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Is the backlight coming on at all?

Regardless of whether or not the display is good, the backlight should come on.

Look for a lid close switch, and make sure it's not stuck shut!

Check and re-seat cables and look VERY carefully for cable damage, bent pins, and make 100% sure any ribbon cables are seated ALL the way.

Shine a VERY bright light at the screen...if you can see something, then you have working display but failed backlight.

Some displays hide the inverter board in the base of the lower front bezel, then feed it power through one of the wimpy little wires going from the mobo to the display. These are very fragile and can break and if there is a short they will scorch and fuse very easy.

Others have the inverter board in the base above the mobo, which is better, because you are then running less current but LOTs more voltage over that fragile ribbon cable or bundle of fragile wires..