It's not about voiding a warranty, it's about having a warranty claim processed.
You can maintain your stuff all you want, but if your shit breaks, and you want someone else to pay for it, you're going to have to let them fix it.
That means taking it to best buy, or another authorized repair shop.

Look, all I know is if I buy a computer and it breaks up with me and fucks off to another dimension, I'm asking for a refund.