As an afterthought to a comment on this thread at Chicagoboyz, Bill Brandt remarks:
I guess that could be a thread, too, how so many people think like lemmings. If the part is in there it must be the right part.
I've noticed this in electronics. Memorable recent example: I designed a controller board a couple of years back. The client's been having them built, in onesie-twosies, as needed - not building a bunch at a time because they're expensive (and also there are some stuffing options according the the product being built).
Last fall, the client's techs were having a total nightmare with one board. Things just weren't working right, and they couldn't even get it into a state that would allow proper functional testing, because the FPGA was failing to initialize.
Eventually I got my hands on the board, confirmed that the FPGA was misbehaving exactly as I'd been led to believe, and that the little chip resistors that set the configuration mode were installed in the right places... and yet the FPGA was behaving as if they weren't. WTF?
Oh. They were supposed to be 330Ω, providing adequate pull-down while allowing (hypothetical) ICT equipment to override the level. Actually installed: 10K.
And, further: I found several other resistors that had entirely wrong values. There may have been still more, but, the basic insight having been achieved, it was time to hand the board back to the techs for further detailed inspection, lest my consulting hours add up to more than the cost of just pitching the board and ordering a replacement.