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Troubleshooting
You may from time to time hit problems in your setup or when running software or hardware with your Raspberry Pi 2. A good first place to check for help is the eLinux Raspberry Pi troubleshooting page at http://elinux.org/R-Pi_Troubleshooting.
As well as this site, the official Raspberry Pi website has an active and friendly forum where you can post questions for help at https://www.raspberrypi.org/forums/.
Finally, the Raspberry Pi section of Stack Exchange is another great resource, athttp://raspberrypi.stackexchange.com/.