Re: Go with the flow,
Once worked for an IT waste refurbishment (new stickers on old junk) company, no formal customer support although the owners were ex IT support people themselves. I had to take someone through booting from an XP install CD, getting to the recovery command prompt and doing chkdsk /f, over the phone, letter by letter. Disk corruption caused by not shutting down.
There were occasional good days, like when we got in a BBC Master that turned out to have the Domesday Project SCSI controller and second processor fitted. If they had the Laserdisc drive too I'd have taken it off their hands myself in short order.