Check out Raspberry Pi's Troubleshooting Page for answers to questions such as:
- What is the username and password for the Raspberry Pi?
- Why does nothing happen when I type in my password?
- Why does my Raspberry Pi not start up/boot?
- Why is my Raspberry Pi hot?
- I keep getting a lightning bolt symbol and messages about power...
- My SD card seems to have stopped working.
- I've imaged an SD card with Raspbian/NOOBS, but when I look at it with my Windows PC, it's not all there!