I cannot print wirelessly to an Epson 810 from a MacBook Pro (2010). Stopped working with version 4 and has not worked since. Prints fine to Safari, Chrome, and all other programs. Resetting didn't help.

Prints fine with other browsers and programs. Works with my wife's MacBook Pro.

Took it to Apple Genius, they told me it was my memory (incompatible)
Believe the first one.  No one RAM test will reliably indicate RAM is bad.   Once indicated, it has to be replaced.
You have to get RAM made for the mid 2012 13" MacBook Pro.    Just because it says it 4GB of 1600MHz DDR3 memory does not mean it is compatible with your Mac.  You have to buy RAM for Macs with lifetime warranty, that is not ValueRAM, and says the model and its time frame within the year that it was released, and its model number when buying RAM.  Both http://www.macsales.com/ (OWC) and http://www.crucial.com/ sell RAM in that means of attributing what kind of RAM it is.
I ran an internet-based free diagnostic tool and it showed that my hard drive did have bad parts (corrupted? possible to fix or not?) and it was acting irregularly...
What tool?  Some are known to damage software components of drives.  Especially any that address system cache.

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