I recently got a replacement XPS 13 due to my first one having issues with high-pitched noise coming out from somewhere inside. Technicians and Customer Service couldn't point out the culprit so they replaced the laptop altogether. And now I am having the exact same issue on my replacement machine. I see from different forum posts that this issue was discovered as early as May/June 2012 and it is still out there. I assume this might be "standard", but people don't notice it due to the frequency.
For such a premium machine with a pricy tag on it (the model I got: i7, 8 GB RAM, 256 GB SSD (1080p edition btw) was priced at NOK 10495 with standard options) you'd expect such issues to be non-existant, if not fixed by now.
I LOVE the XPS 13 in every aspect possible; the lightweight construction, premium feel and solid performance. But I'm often in very quiet areas with this machine, and the noise drives me insane. (I'm a student)
Note: While flashing BIOS connect the Ac adapter and make sure the battery has minimum 15% charge as this needs uninterrupted power supply. Do not use the system till it restarts and comes up to the desktop.
In case issue persists even after flashing BIOS to the latest version, kindly send me a private message with the system service tag. Click on my name and click Start Conversation to send me a private message.
Thanks and Regards, DELL-Sujatha K Dell Social Media and Community Professional #iwork4Dell