Hello and welcome to PC Help Forum.
If the damage was to right side of the computer tower then your motherboard could be damaged.
Clicking hard drive is usaly a sign they are going to fail.Also if it is not reconised in BIOS this could be an indication of failure or it is due to fail.
Could you check connections by opening up the computer while it is disconnected from power supply and check all cables and connections have not become loose?
If you are not a total gamer and just a general surfer/downloader you do not need a high specification machine then you can replace your motherboard and
CPU at a decent low price.
I would not use the
CPU on another motherboard as it may not be compatable.
If you wish information on replacement parts then I am sure we can give you pointers on what to buy.
You maybe able to salvage some parts from the old computer,maybe CD/DVD rom or a few cables wich will cut down on costs.
I am not sure of the laws in the USA but if it has been some time frame since you recieved the computer then you may not be able to claim compensation.But it is worth a try.