Hopefully you kept the Powerlite? Sounds like the ignitor (or lamp, but I assume you tried that already) or could be a loose wire. The Powerlite R47 and 115 use the same refractors so whatever you used in the Powerlite for FCO optics can be used in this light as well.
If you want to make the light pattern long and narrow, adjust the socket so it's as far out into the reflector as it will go (which it appears to be). This is "Type II" distribution. To adjust to a shorter, wider beam (will light less to the side of the light and more in front of the light), adjust the socket so it's as close to the "pole" as possible. That will provide "Type III" distribution.