Black screen with white writing on boot - then nothing...

Ok, this is a long story, but here's the abridged version;
I have a mac mini - the old PPC version. It has just come back from being repaired - replacement logic board. However, repaired it is not. Every time i try to start it up, I get a brief white screen with grey apple logo as normal, and then a black screen with white writing on. The writing is exactly the same text as you can see in the console system log. It gets about a page-full through this, and then goes completely black. No video at all.
However, the machine is still working in there - I know this because I'm typing on it now via VNC. It is perfectly happy and all. It just does this weirdness start up and then no video.
My question is twofold:
1. The company that repaired it claims that it booted fine before they gave it back to me; however, it hasn't since I've had it back. Could the boot behaviour be some kind of diagnostic thing they left on my machine, or a mode they left it in. If so, how do I get rid of it?
2. Failing this, does it sound like my vidoe card packed up maybe?
Thoughts, solutions, etc., most welcome!

Have you
tried to simply do a clean install of Mac OS X and
your other software? I normally find that this fixes
90%+ of all unexplained software related issues.
I could, but (a) I'm not convinced it's not related to the replacement logic board and thus a hardware issue, and (b) I can't see to do a clean install because it has no video signal

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