Answer:
hard drive
Step-by-step explanation:
Based on the information provided regarding the scenario at hand, it seems that the problem with John's computer is the hard drive. Most likely the hard drive has failed. When a hard drive disk platter begins to fail it will no longer save data correctly and will begin making a loud clicking noise which is the needle missing/scratching the disks. Which is exactly what is happening to John as he is trying to save the game.