If you haven't done so yet, you can try the newest recommended F/W G00-B5. It specifically mentions a fix for boot stuck at 25%. You could also possibly try the reset tool that was used for the 8 series. I think the file name was A789be.tar . You can remove the storage board and try to do the firmware without it installed. It will do the printer and scanner firmware but of course will fail on MFP.
So here is what i would do first.
Power off and unplug machine
Disconnect all accessories, IE finisher, fax, etc
Remove CPU board and storage board and clean connections and reseat CPU board. don't install storage board just yet.
Try newest firmware, If it boots to firmware screen and loads scanner and printer, then reinstall storage board and try firmware again, and if it gets to the firmware screen do MFP only.
If still not able to boot past 25%, then try the reset tool.
If it does get to the firmware screen and loads successfully, but still does not boot past 25% then you can call tech support and see if they will give you the code to do a partition Initialization on the storage board.
Beyond that you are looking at replacing the storage board.
Hope some of this helps
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