My computer sounds like an airplane during takeoff, should I be worried?

Most computers have multiple components that have audible moving parts, such as fans, CD/DVD drives and hard drives. More often than not a grinding sound is just a ball-bearing in a fan that has accumulated a good bit of dust and dirt. Most fans are inexpensive and easily replaceable. Sometimes older hard drives make a grinding/grating sound that is fairly high pitched. Drives have bearings in them as well as fans and these can be early warning signs that a drive failure is on the horizon and backing up data is highly recommended. Clicking sounds are often the hard drive and in these cases the computer should be shut down and brought to us immediately to avoid data loss. Lastly, CD/DVD drives often vibrate loudly when a disc is in the drive – even at times you are not actively using the disc another program might prompt the drive to check for media and cause the drive to spin the disc and makes a noise.