Hi, just wondering if anyone else has any ideas on this one?

I've tried swapping the parts between a known working unit, and this one. I've swapped RAM, HDD, Cache card, basically everything that is accessible on the rear of the TAM without disassembly. I've tried booting with the internal CD drive, and an external one, but I still get it freezing on the 'Welcome to Mac OS' screen.

All of the components also work on my good TAM, so it has to be something else. It seems to run perfectly apart from this issue, so I'm guessing it is a very minor issue. I feel like I am 99% of the way there with it, it has a great hard drive, CD drive, the monitor is great, just the freezing.

Thanks for any help you can give!