Guinea Pigs "squeak" when they get excited, when they're happy, or when they're scared.

When we were cleaning the guinea pig cages at work they always get some red and yellow peppers in the morning. Well we gave this white one his, and gave some to the others, and he just.. started squeaking like crazy! After thirty minutes I was like "Terri (the MOD) I think he wants some more peppers!!" and she was like "yeah I think you're right" so she gave him some extras, he stopped squeaking, walked to his food bowl and SAT on them. And stayed there all morning lmao

Anyway I know that doesn't really help you much but, does your gpig have a place to hide in the cage, such as an igloo or something? That might help. Otherwise ummm put a blanket that covers half of his cage?? Otherwise just spend more time with him!