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Sounds like an internal loose connection. Must have happened if it had fallen down from you. If you are patient and careful, you can repair it yourself. Else don't go for it as it can damage more keys. Just open the remote set and you will find what had been detached from where it should be.
I've seen this before on other laptop models. The cause of those have been that the internal power socket has become detached from the motherboard. This is not easy to fix, most repairers will recommend a replacement motherboard which can be expensive. Ask around, if you can find someone who does any electronic soldering they may be able to open the laptop up and reconnect the internal socket for you.
If, however, the laptop is still under warranty take it back and it should be repaired for you for free (my son did this with a laptop bought through PC World).
You will need to purchase a 4-prong power cord and convert the appliance to meet the needs of the wall receptacle. This is a requirement of the National Electric Code in homes that have the 4-prong receptacle. The following link explains how to convert your dryer cord from a 3-prong to a 4-prong:
These rules apply to the conversion of electric ranges, as well. Read through the link thoroughly and let me know if you have questions. If you require additional assistance, please let me know before you rate the solution. I hope this helps you.
The wire you have is designed to carry 220 volts. Assumming that your socket is a 220 socket and that is what your application is the following answer applies. The black wire goes to one of the straight prongs and the red wire goes to the other. The white wire goes to the tight angle prong and The ground wire goes to the ground screw. good luck
I would to make sure all the power plugs on the inside of your computer are snuggly secured. Also check to make sure the RAM sticks are plugged in correctly and that the processor is present and in place.