hardware broken?

[gosha]

Hello,
in the last couple of months playing music on my macmini ppc running 4.5 release would give strange results, that is skipping a lot. Lately, I upgraded to 4.6 doing a fresh install thinking it might have been something I broke , but in fact the problem is still there. Although slightly less (now I don't run X on macmini, and use my notebook), but still there. Either I use mpd or mplayer or whatever, the problem exist. I've tried to copy the song into the internal drive, but it's the same.

Should I get concerned about my hardware? Should I get prepared for a sudden death?