Something as seemingly unrelated to what you were doing (video vs optical drive), or as strongly related as ASP and a hardware catalogue, is a good time to suspect a confused persona in the 9500. If you haven't already, do a complete MLB reset:

1) mains and battery power completely removed for 10min or more, with the wanted hardware all in place and checked for cable security, seating and so on;

2) reinstall the battery 10-30sec before using the CUDA switch;

3) reattach the mains power, and then start up.

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