Try 60 seconds. notes a refurb is 399 so repair OOW (out of warranty) can exceed that.

As there is nothing to lose, open it up and unplug the ram and reseat just one stick, retest with one stick. Add the second if it comes back.

A lot of new laptops are shipping in just a few weeks so I doubt repair will beat replacement costs.

I like to extend warranties when I know I don't want to pay for OOW.