My cousin's guitar fell on to my ps2. That made the disc cover broken so now, it won't close every time I close it. So i have to put something over it. I need help bad.

There is not much we can suggest to help there other than to contact Sony themselves regarding repairs. Due to how the system got damaged it definitely would not be covered under warranty so you would need to pay for the repair (or if it was your cousin that dropped the guitar have him pay for it ).