Cant boot G4 tower

hi
ive been running a G4 tower 800mhz at work from an external lacie firewire drive with the latest tiger without any trouble so far.
however, since i took that drive home and connected it to my cube there to transfer some files, i cant boot from it any more.
the drive is completely fine and all my files are ok. just since i reconnected it at work, it doesnt boot anymore
it gets stuck at a standard blue apple desktop background.
ive done most of the things i could think of, including:
- removing any startup items
- single-user mode with some codes to reset vram etc
- verbose mode doesnt give suspicious messages
- verifying the disk using disk utility doesnt give errors
- no third-party ram
any help? what can i do to make my disk bootable again?
any ideas why it became unbootable just by connecting it to another mac for like an hour or so?
thanks a lot for suggestions
maarten

no i didnt boot the cube from the external firewire drive. just connected it. went into my home folder on there, copied the files over, and disconnected it again
didnt do anything more with it
archive and install. sure a solution, but quite a pain. id prefer to find out whats wrong. i thought it might have to do something with permissions, but i repaired those and it didnt change anything. still stuck on startup....
maarten

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