If you can't be bothered with all that here's a great thread on problems so you can figure it out.

Revised: The Complete Guide To Sick Plants,pH and Pest Troubles - PlanetGanja.com

Without any info....and hopefully a pic......i can't do much for you.
Weedhound Reviewed by Weedhound on . yellowin from inside on new shoots..... just put into 12/12 was fine b4 2 days now startin to turn yell lil brownish from centres of all new growth tops an side shoots whats goin on ? v concerened can i remedy this b4 it gets worse pls any sensible suggestions an i pass u 2's Rating: 5