Not detecting Arduino Mega 2560. It worked before but now not detecting I am using Windows 8.1 64 bit. I have an Arduino Mega 2560. I configured and installed it with the Merlin firmware before. I had a system format in between. I tried to connect my Arduino again.

I have the following problems:


Not detecting any hardware when plugging in the Arduino board: the green LED is on and the yellow LED is blinking. I checked the Device manager. It doesn't come in either COM ports or other devices. (The last time it came in COM ports as Arduino Uno). I installed legacy hardware on COM 3 (which was used before) and tried to update the driver from a newly downloaded version of Arduino. No success. I disabled the certification signature requirement from boot menu and tried: again no success.
The serial port on Arduino is greyed out.


I need some help. I am running out of ideas. I tried uninstalling COM port. I cleaned the registry with CCleaner. I uninstalled all Arduino software. I rebooted the system. I downloaded everything again, then connected the board. Still not detecting the new hardware. :P

Help me out.
What you said has happened to me before.This happened to me as I supplied over 20v to the arduino.Did you supply a higher voltage than recommended or pull too many amps from the board?If you did so,it is almost futile to try to repair it.