I was once working on a live MRP server after hours. It was needed to do everything from customer service to shipping to tracking work in progress. So if it goe

I was once working on a live MRP server after hours. It was needed to do everything from customer service to shipping to tracking work in progress. So if it goes offline, they would basically have to shut down until it was back. I needed to reboot at one point and when I did, it started giving me "boot disk not found". I couldn't get it to boot, at all. It seemed the boot disk was corrupted. I was literally in a cold sweat for 2 hours, late into the night, until I finally noticed that I had left a diskette in the drive which was causing the bios to try to boot from there first. I have had plenty of other cases where I actually messed something up. But that feeling you get when you think you have irreparably broken something is so terrible.