I built a PC for my little sister in 2007. She was starting college and didn't have a computer. It totaled 2805 and some change, custom built through Antares Digital (When you know, you Lili). These were all top of the line components (Asus M2N32-WS PRO, Amd athlon64 X2 AM2 5200, Corsair Memory). Not a cheapy system in its day.
Three nights before I was to deliver it to her, I completed all of the setup, had all the software ready to go, even setting up a custom theme for her (We were both metalheads). My folks said that she would need a printer/fax/copy/scanner as well, so last minute, I ended up buying an HP 5610 at target for 192 dollars.
The HP instructions didn't say that if you connected the cable between the printer and the PC before you had installed the drivers, the printer would not mount as a device. In fact, it would never connect to that PC ever again. Apparently, it ruined the registry until you reformatted and reinstalled the OS.
To be fair, the manual did say to install the drivers first, then the cable, but this was not the norm back then and they didn't really emphasize it in any way, nor did it mention that you were about to be FITA big time. Had to scramble to completely reformat the drive, reinstall all the software... Essentially, starting over from a blank slate and getting done in 2 days for delivery to her dorm on move in day. It did connect second time around.
I wrote them an angry letter regarding the poor deployment, but of course I never heard back from them. Never bought another HP for myself or anyone else ever again. I go out of my way to encourage people to not buy anything from HP. If I happen to be somewhere and see someone looking at an HP printer, I'll just approach them, introduce myself, and tell them my story to discourage them from buying it.