trouble download driver for arduino mega 2560

Why doesn't my sketch start when I power up or reset the Arduino board?.I'm having trouble with the FTDI USB drivers.What if I get a gnu.io.PortInUseException when uploading code or using the serial monitor (on the Mac)?.

Why doesn't my board show in the Tools | Serial Port menu ?.

Why does do the Arduino software and the Tools menu take a long time to open (on Windows)?.

What can I do about cygwin conflicts on Windows?.

What about the error 'Could not find the main class.'?.

What do I do if I get an UnsatisfiedLinkError error (about native library librxtxSerial.jnilib) when launching Arduino?.

Why won't Arduino run on old versions of Mac OS X?.

What should I do if I get an error when launching arduino.exe on Windows?.

Why does my Diecimila take such a long time (6-8 seconds) to start my sketch?.

What if my board doesn't turn on (the green power LED doesn't light up)?.

Why does the Arduino software freeze when I try to upload a program? (on Windows)?.Why doesn't my sketch start when I'm powering the board with an external power supply? (Arduino Diecimila or earlier).What type of power supply should I use with my Arduino board?.Why do I get a when I try to compile my program?.Why doesn't the Arduino software run after I updated the Java on my Mac?.Why do I get 'Build folder disappeared or could not be written' on Mac OS X?.Why I can't upload my programs to the Arduino board?.If your port doesn’t appear, try restarting the IDE with the board connected to the computer. The next thing to check is the port you are using to communicate to the Arduino. In the Arduino IDE software click on Tools>Board and verify that you have selected the same board you are using.

If you do not see an available serial port in the Arduino IDE after plugging in your board and waiting a moment, then you may need to install the drivers by hand. The Arduino Uno will appear as a ttyACMXX device. WHAT TO DO IF port is not showing in Arduino? If there is no COM & LPT section, look under “Other Devices” for “Unknown Device”. You should see an open port named “Arduino UNO (COMxx)”. Once the System window is up, open the Device Manager.

8 How do I enable ports in Device Manager?.

7 How do I connect my Arduino to Windows 10?.

6 Why is my Arduino not connect to my computer?.

5 What does board at null not available mean?.

4 Why won’t my Arduino connect to my computer?.

2 WHAT TO DO IF port is not showing in Arduino?.

Trouble download driver for arduino mega 2560