There are two connectors to check on those.
One is on the mid-left of the machine, under the keyboard, to the right of the PCMCIA card cage and cooling fan. It's covered mostly by the clutch cover, but if you have something small and plastic, you might be able to poke the connector back down without removing the clutch cover (though that in itself isn't too difficult if you're careful).
This cable can come loose every now and then, it's just a simple interference fit - slip on, slip off.
The other is in the display itself. It's kind of involved to check that one, and since it's clipped in, it's unlikely to have come undone during transport.
To open the display, you'll pretty much have to pull it off of the bottom of the machine, so use that opportunity to examine the LCD's flex cable for tears (while making sure not to tear it yourself!).