My Surface Pro 4 has developed the following problem: it will not charge when the machine is turned on and the power cord is attached. The white LED is not lit . However if I turn the machine off, unplug and replug the power, the LED turns on and it does charge. Until I turn the machine on ... when the LED goes off after 3 seconds, and charging stops.
Windows 10, patched up to date. Machine is 2.5 years old.
Any ideas ?