This sounds like a power supply defect for sure, at least based on what you are telling me. I am very sensitive to the high pitched noise you mention. In fact (off topic) my 32" LCD TV makes that noise every time I turn it on, and it stays that way for a while before fading. I almost returned it but it seems to be a normal part of its operation.

That being said, the power supply for your router shouldn't be doing that. Perhaps the replacement came from the same series from the manufacturer (I'm sure NETGEAR definitely does not make the power supplies). If all else fails, you should try returning the router to the store (even though you like it) in hopes of getting a power supply that works.

Peter Redmer
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Same problem here - European adapter, too, and it chirps and twitters nastily when the load increases, e.g. when a USB device is connected.
Anyway, from what I've read here, it really seems to be a series problem.
I'm using another adapter found at home, and have written to the seller.

As I'm planning to use a 2.5\" USB hard disc on the router, I'm probably going to modify one of those external 3.5\" hard disc adapters, which can deliver 12V for the router and 5V for the HD - and they're perfectly silent ;-)

I like the router, too - flashing DDWRT worked no problem.

Same here, same P/n and model, bought in France.

Very very very annoying, even for a 37ers like me, even a 7 meters away (max length of the room).

--> The router got back in its box instead of replacing the linksys.

I'll change the power adapter or move the setup to another room when i have some spare time.

I just bought one in US, and I am hearing a high pitched noise from the router itself. The sound is the same whether connected to the wall directly or through APC UPS which regulates the power and prevents spikes.

I got my wnr3500l a few weeks ago, I haven't noticed any noises bleeping etc.

may i ask you both how old you are?(serious question!)

@kwbolte
I hear a lot of good things about Netgear support. I guess they intend to stay in business for long, and if they keep it up, I am sure they will.

@ginchiller
I am telling you guys, I, my wife and my kid do not hear a thing.
I can only guess that the adapters you are using either shipped with some manufacturing error, or, somehow it got damaged during shipping.

My 3500L (from jan 2010) also produces a high pitched whine - I cant hear it from about 1m away though so not much of an issue for me :)