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Toshiba laptop problems

December 14, 2012 3:49:32 AM

I have a Toshiba Tecra R850,
I use the computer to program PLC's via a USB cable.
When the Computer is plug into the 240v mains power via its power supply it turns the PLC off.
I tried a different USB lead without success.
Removing the mains power fixed the problem.
Is it the power supply or the Laptop which is faulty?