The last few days my 3D printer has not been working, despite the fact that the LCD Screen has been working perfectly (since the problem the LCD bright potentiometer went very sensitive, so the brightness set to the maximum although before the problem it was perfectly calibrated).
The problem arrived when I was unplugging the fan from the board because it wasn't working while the printer was on, suddenly the LCDs brightness set to the maximum so I turned the printer off as fast as I could. When I turned it on again, I had to recalibrate the LCDs brightness and when I tried to move the steppers the weren't working, some of them made strange noises and didn't move. I have to say that now every time I turn on my printer, an orange LED flashes, but I cannot remember if it was normal or not.
My 3D printer: Geeetech I3 Pro B 3D Printer DIY Kit - Black US Plug 1
The board I'm using: XCSOURCE® Kit de impresora 3D con RAMPS 1.4 Controlador + Mega 2560 Board + 5pcs A4988 Controlador de motor de pasos con disipador de calor + LCD 12864 Controlador gráfico de visualización inteligente con adaptador para Arduino TE621