MBA doesn't boot with Ethernet plugged in /Startup disk ok

Hi everyone
My Macbook Air running OS X no longer boots when the ethernet cable (via USB adapter) is plugged in - it gets stuck at the grey screen. It starts booting as soon as I unplug it.
I have already reset the startup disk, but to no success...
Internet works fine when I plug it in after starting up.
Does anyone have another idea?
many thanks

Volker1 wrote:
 I've got a suspicion that the Thinkpad bios/efi is not simply executing the first stage bootloader, but looking around on the GPT disk and then crapping its pants when it doesn't find Windows.
Right now I have a MBR-formatted harddisk in the ultrabay with the bootloader in the MBR. Once I get the bootloader off the MBR disk, I can easily continue to boot from my GPT-formatted SSD.
Yes, it seems that it's a BIOS bug at least on T520, T420s and W520 laptops. Even in "Legacy" mode first stage bootloader doesn't execute if partition type is 0xEE (GPT).
Hope Lenovo developers will fix it. They fixed something on BIOS 1.31
[Problem fixes]
- Fixed an issue where the computer might not be booted from bootloader program.
 but it doesn't work for now. Pity.

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