Laptop (Windows 7, Sony Vaio) automatically shuts down, retarts and then after a minute shuts down, restarts etc in an endless cycle when the ethernet cable is plugged in.
When the cable is removed or LAN adapter is disabled, no problem.
The problem still happen in safe mode with networking.
I tried disabling and re-enabling the adapter, deleting and reinstalling the driver, disabling auto restart after crashes, system restore (didn't work), restoring to the last known good configuration. Nothing helped.