PRAM and SMC Resets - Can anyone explain (just had to do PRAM reset)

Discussion in 'Mac Basics and Help' started by luvmymbpr, Mar 6, 2014.

  1. luvmymbpr macrumors regular


    Mar 6, 2014
    Hello everyone,

    I just had an issue with my new MBPr where an external USB keyboard refused to work on the left USB port. The right USB port was fine, and other devices worked on the left. After some googling, I found PRAM and SMC reset suggestions. I did just the PRAM reset, and hooray everything is working again.

    With that said, I crave knowledge and knowing exactly what the PRAM and SMC do, why you need to reset them, in what order, and did I take the appropriate steps? Being a PC guy for over 15 years, this troubleshooting is new to me. Any information would be very help! (I'm continuing to search and just can't find any good, complete write-ups on the topic)

    Thanks! :D
  2. satcomer macrumors 603


    Feb 19, 2008
    The Finger Lakes Region
    To put in laymen's terms it reset the controller on board for all the controller chips on the logic board. Hence it "resets" he controller portions too on the logic board that controls the USB ports.
  3. Altemose macrumors G3


    Mar 26, 2013
    Elkton, Maryland
    It is essentially the same as pulling the CMOS battery off the motherboard. It resets the logic board which can be quite beneficial.

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