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It's possible you cracked a chip or two when it dropped, or damaged a connection between a diode, capacitor or so.
It's also possible that a ribbon has come loose within the device, which will need to be tightened again. But your message is also a bit unclear.
If the screen isn't responding, you may need to tighten the screens ribbon cable, after that if it isn't working the GPU may be cracked. Afterwards, if that doesn't work you may have damaged the mobo itself.
If a USB port isn't working, the usb's connection to the mobo needs to be re-soldered. Or a replacement USB may be needed.
You're going to have to bring it in for work possibly, unless you want to try to fix it yourself, in that case you can order replacement parts for laptop on eBay since companies themselves do not sell replacement parts.
Possibly wait a day and see if it works afterwards, when something hits the ground it has a lot of friction go through it which will cause a lot of heat to it.
If the laptop switches off as soon as you insert the usb cable, there is a problem with either the usb socket or the cable. It is a safety system which stops usb power being re-directed down the usb data lines. If you have tried multiple cables with the same result then the problem is with the usb socket. try a different socket (a usb hub will help if you are short of spare sockets). Using a mall light, and maby a magnifying glass, inspect the usb port for bent pins or contacts, some sockets have pins (older dell machines especially) which are not supported at all by plastic backing strip and can be bent easily by inserting the usb plug incorrectly or by children armed with a pen etc. If you find bent pins (there should be 4 pins evenly spaced or 4 metal strips along a plastic backing peice) remove the battery and attempt to realign the strips with a small screwdriver. switch the laptop on and try a usb plug in the socket - make sure you insert the plug gently and squarely (and the right way round). If the laptop still fails, have another go or ask someone else (who is nimble fingered and technically minded) to try it. Don't give up (unless you find the socket is broken ie. missing pins) I can guarantee 99% that this is the problem. good luck
Unfortunately, I have seen this many times. One of the major problems with the C400 model was the USB port failing. I have had many of them replaced under warranty, and I have repaired some. The USB port breaks loose from the mother board and stops working. It is possible to SOMETIMES disassemble the laptop enough to get to the port and re-solder the USB port connections. But is is a slow process for experienced people. And it does not work all of the time. i know that this is not the answer that you wanted.