I have a computer case and it has this pretty blue lite fan in the front but the down side is as of recently it makes a lot of noise. A ton on boot up and then it calms to about half the noise but none the less still loud. I'm looking to buy a replacement, hopefully one that is silent, problem is that I don't know the first thing about PC case fans, how to replace them, how to tell which is a good replacement. I also don't know what kind of case I have so I can't look it up and just figure out the fan size that way. Help would be appreciated.