I never noticed this until I used my MBP on glass table in a quiet room yesterday, but there is a faint hissing/buzzing noise if I put my ear near the lower left side of the screen - where all the ports are. It happens regardless of whether it's running on power or battery, but if the room is quiet it can be heard if you put your ear near the lower left side of the screen. I have an SSD (silent) hard drive and I'm sure it's not the fan. Any ideas? Can others listen carefully for this faint hissing/buzzing and let me know if you notice anything? If this is something that should be looked at by Apple, what's the procedure? I have Applecare...would they replace my laptop with a new model or send it in for repair? What do I do for a computer in the meantime if they send it in? Thanks!