I just got my arduino nano V3.0 today. I also got an SD card reader and an LCD screen. I decided to connect a speaker to it and use the SD sound library to play music and display stuff on screen. I had it all working good and i was listening to some music when all of a sudden there was a crackle and then the music glitched a little. I then noticed a low hum in the background of the music that wasnt there before. The LCD screen was dim when i looked at it and the back light was flashing lightly. I looked back at my computer and saw "USB device not recognised." down the corner.
I reset the board using the reset button. The board's LED seemed to flicker for about 20 seconds before it started to display stuff on the screen like it was meant to. The board gets stuck with the LED flickering for upto 3 minutes so far. The speaker is quite, USB wont connect, display shows corrupt characters and the volt meter shows 3.1volts on the 5v pole and 3.0v on the 3.3v pole with nothing connected.
Is there any way to fix this? What is broken? What other information do you need?