Hello, i want to tell you my story.
After 4 months, my Sensation started to have the "dust problem under the screen" and the sound speaker distorced at higher levels problem.
So i decided to send it to HTC, my warranty was still ON.
Today after 10 days i received it back, and it has THE SAME PROBLEMS as before.
They did absolutely nothing and i'm so disappointed about HTC.
My speaker is still distorced at higher volumes, the screen still has dust inside the screen, nothing changed.
I'm really angry, i've read in this forum that most people who sent their sensation back got the screen repaired and the dust problem gone, but that's not my case.
I'm going to call them again today, i hope i can solve something.
EDIT: the only thing they did was a Software Update. But i already had the latest Update !! WTF.