At my last IT job, we (the tech team) were working on a classroom PC deployment project. We researched and selected the components we needed for the builds. I first ordered enough parts to build about two or three machines for testing purposes.
We built the machines, but ran into stability problems - random crashes, lockups, and boot errors. A motherboard or two soon died.
We initially thought that we got a bad lot of motherboards, but the boards worked fine with other systems.
Turns out that the small form factor cases (my boss wanted the smallest cases available) had crappy proprietary power supplies.
When we went to the boss with this information, he totally dismissed our findings and insisted that we order twenty or so more to build the rest of the machines. One of the guys on our team argued with on the matter, but it was pointless - our boss wouldn't budge.
So we reluctantly ordered the parts and assembled the PCs. A couple of power supplies actually blew up (big sparks and smoke) when powered on.
When finally deployed, we had all kinds of problems. Students constantly complained about issues (of course) and the we were running around putting out those fires.
After about a month or so with these problem PCs, and all of the associated headaches, our boss finally relented and told us to pick out a more reliable case.
We re-did all of our previous work, rebuilding the PCs with the surviving motherboards, and they were solid - rock solid.
If only our boss had listened to us in the first place, the company would have saved thousands of dollars in equipment and man-hours.
I was eventually fired after I trained my replacement, who I presume earned less than me.