Current symptoms: first sign was a consistent horizontal screen flickering. Force Quit and Relaunch of the Finder seemed to cure that. But since then no BOING chime at startup. Startup takes twice as long as usual. Once up and running, normal operations seem sluggish, though no frequent spinning beach balls seen yet.
What, at first sight, would you say is ailing this MacBook Pro? What would be your recommendation for testing that diagnosis? And what therapy would you suggest if your diagnosis is borne out?