what I done to fix my friends RROD was to apply pressure to the bottom of the 360.Turn the 360 upside down and apply pressure to the middle of the 360. MAKE sure to still apply pressure when you turn the 360 back on as well, so keep one hand on the 360 applying pressure and use the other hand to turn the 360 back on. Also you may try to tap the 360 on the left side of the console when standing upright, that may work for you as well.
look on youtube they have tons of videos how to fix it the way if fixed mine was stoping the fans from spinning for 5 min unpluged it and 20 min later turned it on and started to play