Usual suspects are -
inadequate power supply
incorrectly written SD card
SD card not making complete contact with the sd card slot in the RPi.
In respect of NOOBS - does the sd card have a top-level folder/directory named 'Noobs', or 'Archive' or anything similar? Because it shouldn't! The top-level of the card should contain 2 directories named /images and /slides and about 6 other files - that's all. These files should be visible when read by a Windows PC, mac, or other linux system.
How To Ask Questions The Smart Way: http://www.catb.org/~esr/faqs/smart-questions.html
How to Report Bugs Effectively: http://www.chiark.greenend.org.uk/~sgtatham/bugs.html