The specific computer is a Toshiba Satellite L505D-G6000, which seems to have sustained damage to the mobo from a nearby lightning strike - networking and ports failing, in particular. I can obtain a replacement mobo - same model, etc - and I have done enough building and upgrading to think I can replace the mobo. My question is: Is the OS or the HD tied to this specific mobo so that if I replace this mobo with another - even the same model, etc - the new setup will not function normally. I encountered this problem once with a mobo I bought from an independent vendor but was able to contact the mfr (not Toshiba) for the routine and the codes to "prep the board." Am I likely to encounter a similar issue here? If so, is there a workaround? Ordinarily, I'd return the notebook for service but it is out of warranty and the quoted price is about 4 times the cost of the motherboard. Thanks to all for your attention.