Hum,
Strange one that... it boots then resets....(?)
The only thing i can suggest is that it seems to be a heat related problem...
Have you reseated the Rom chips on the motherboard?
(check them, as the heat may cause them to loosen)
And you do have the correct libraries for the accelerator? (the ones on the disk!)
Try it without the accelerator fitted...
- And use the hold two mose buttons down trick, when booting... -
Good luck!