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I flipped it over and it seems like it's something to do with the bottom case and how to air is traveling through the perforations. What I've noticed is that it's coming from the bottom right (as you are looking at the laptop straight on). As soon as the fan kicks up a little, the whistle is back and again gets louder as the fan gets louder. Well, as luck would have it, this is exactly the same as the first one. I thought maybe I had gotten a defective one with a bad fan so I went back to Costco and returned it and bought another one. I asked my wife to confirm I wasn't crazy and she noticed it right away as well. As the fans turn faster, the whistle gets louder.
As soon as it had been running for 15 minutes I immediately noticed a high pitched "whistle". I purchased the Legion 5i from Costo with the 1660TI graphics. Lets see what the postman brings hopefully I can enjoy the new Legion without this "feature". I did educate myself prior and looked alot of the tests from legion 5 no one mentioned that sound also Linus Tech tips said thats only a "wooosh " sound and no wining. I dont know if the past years i has been established that every gaming notebook has this noise. I also had an HP Pavillion 15 gaming with iti this was much more annoying that the legion. Dont know if i could live with the annoying noise got the system around 970 Euros on Amazon Prime Day deals and my other Laptop is nearly 6 years old. I suggested to them to send me the heatpipes and fans so i could change it myself but they said, if i do that i will loose warranty so I returned it and ordered another one at amazon and sees if it has the same whining noise.
One technician said yes its normal another one said its not normal and i should send in. Thanks for your reply, I also talked to lenovo and the also were not sure if the whining sound is normal or not.