Laptop fan grille discoloration?

darth_yoda

Commendable
Jun 5, 2016
9
0
1,510
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So I have an Inspiron 7567 and recently I noticed something weird regarding the fan grille on the bottom. It is sort of discoloring. I have attached photos. Just wanted to ask, is this normal? I do game quite a bit, so is it due to the heat? I know it probably doesn't affect anything, just wanted to ask if anyone else has noticed it on their laptops.
 

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