problem on iduino mega 2560 undetected

[kevbme]

Do you know what code I need to type in avrdude for flashing with Arduino uno?

[kris.mao]

Dear friend,

we usually burn bootloader by USBASP。you can refer this link , where there is the method of burning by Arduino uno：
http://arduino.cc/en/Tutorial/ArduinoISP#.Uy2_QfldW_s
http://www.arduino.cc/en/Tutorial/ArduinoToBreadboard

Best regards!

[kevbme]

Nothing is working. I tried flashing the 16u2 and it will not communicate. I am getting an invalid device signature error. I also tried flashing Marlin to the 2560 using the other isp headers and got the same error. Nothing on the board will communicate with the computer.