I have a peculiar intermittent problem on a Mac Mini with dual boot to OSX or Ubuntu (9.04).

About 6 times out of ten, the computer boots to the rEFIt screen in a couple of seconds, and then boots to Ubuntu, as it should by default.

The other 4 times, after switching on the computer, I get a white screen for anything up to 10 minutes or more, after which the computer will finally show the rEFIt screen and then boot.

What worries me is these pauses appear to be getting longer, and there's a concern I'll get locked out of the machine at some point.

Anybody else experienced this, or know a solution? I have no clue what might cause it.