Thank you everyone for all the helpful suggestions. It turns out it was one bad stick of RAM - the other stick was fine. Once I replaced the bad stick of RAM no problems at all. Thanks again
Did this last night. Very smooth process. It's advice on being careful around the home button removal is true. I took my time with it as the membrane is super thin. I also transferred the clear front camera plastic riser piece it was easy but not referenced in the guide
Thank you for this guide - it was very helpful and well written. I highly recommend buying the mac mini logic board tool - it made a huge difference in the ease of that step. Now I have a 1TB HDD in my trusty mini and it took less than one hour to do - thank you.