Hello, is possible to somehow invert gnd and pin13 polarity? I was experimenting with Arduino MEGA yesterday and can't run RGB led anymore if attached to GND and PIN13 PIN12 PIN11, before was ok (I was mixing colors etc.), now seems that GND is not GND anymore. One more thing small yellow SMD led on board marked as L now is switched off when LED is on, before was if LED on then that small led on board as well on. Any ideas?
P.S. Other PWM's the same problem.