Does that Mac have a red Cuda button? Pressing that seemed to help reset it when my Beigey was booting into the OF prompt when I was trying to get OS X onto it. Removing the battery for a few minutes also has a similar effect. I think there's also a way to "reset the logic board" should that level of resetting not to do it, which is usually detailed in the service manual. But yes, you shouldn't be using XPF as it's not designed to work on B&Ws so will only cause problems, and you don't need it.