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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.

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I assume this doesn't occur when you're on wireless? Try a Windows repair –  Dave Apr 5 '13 at 11:38
    
Also, do you mean that, if the LAN adapter is disabled you can plug the cable in and it won't restart? –  Dave Apr 5 '13 at 11:50
    
This sounds like hardware failure on the lan device itself. –  Ramhound Apr 5 '13 at 12:03
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Yes, if the LAN adapter is disabled I can plug the cable in and it will not restart. –  reader Apr 5 '13 at 12:40
    
What is Windows repair? Thank you. –  reader Apr 5 '13 at 12:41

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