I recently bought a Arduino Mega 2560.
Everything appeared to be working fine to start with, I managed to blink LED's and show temperature in the serial monitor etc.
The latest thing i have tried to do was to show text on an LCD. The Text was really dull even with the POT turned up and down.
Now when i connect my Arduino to the USB cable it does not show up in the Arduino software.
Mega 2560 is selected in the board options, but the port is blanked out, as if the pc cannot see the board.
I have tried different ports and the cable is brand new, and work to start with.
I have trioed pressing the Reset button which also does nto appear to work. I have tested the voltages on the power pins and they all seem fine. neither tx or rx LED illuminate but the power LED does.