My Nikon D5100 shutter sound is weird?

I dropped my camera a few days ago and a common problem is that the mirror would get lodged or stuck because of the two prongs,screws,whatever they are called. So i then go it out and it moves freely. But another problem happened after is that my shutter sound is completely different. It sounds more whiny and not normal. Please help!

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Which one of the following DSLRs should I go for and why? (Price doesn't matter)?

1) Nikon D3200
2) Nikon D3300
3) Nikon D5200
4) Nikon D5300
5) Canon EOS 1200D
6) Canon EOS 1300D
7) Canon EOS 700D

Read more: Which one of the following DSLRs should I go for and why? (Price doesn't matter)?