I also have a 7500, which is at the Dell depot right now for a blown mainboard. It took two phone calls to set up the RMA, but once that was done things went smoothly-- at least, they have so far. I've never had a problem with the hinges past the fact that when the laptop is subjected to vibration (such as in a car on a mounting plate) the screen moves-- I suspect it may be time to tighten the hinges...
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To my knowledge, it's not possible to actually HEAR radio signals, regardless of the frequency...
And what does it sound like?
I also have a 7500, which is at the Dell depot right now for a blown mainboard. It took two phone calls to set up the RMA, but once that was done things went smoothly-- at least, they have so far. I've never had a problem with the hinges past the fact that when the laptop is subjected to vibration (such as in a car on a mounting plate) the screen moves-- I suspect it may be time to tighten the hinges...