I have a Mac pro, and inside there are 2 test buttons, one says SMC another says RTC, can some one please tell what they are? and what does there lights indicate? I ask cos (as you guessed) my Mac freezes when ever I give it hard tasks at ones, so I tried every thing till I came across these 2 buttons which I have no idea what they are, please help, my computers life rest in your hands. Note: I get Red light on the SMC and Yellow on the RTC. thank you for taking the time to read this thread.