Sorry about the long story, it has a hardware reference at the end. A little tale about stress and luck:
A customer brought a PC to me because the USB wasn't working in Windows 98. She knew a little about computers, and managed to understand the error message indicated that the BIOS was not set correctly. Not wanting to play around with the BIOS, she brought it to me. No problem.
"We may have to flash the BIOS, update it. Is this ok?", I enquired. "Sure".
So, the USB settings were indeed incorrect. I changed them quickly, and tested with USB modem - detected no problem!
I thought I should do the rest of the 'repair' - flash the BIOS. I correctly identified the mainboard, and downloaded the correct ROM file with flash utility. The flash went through with message "FLASH SUCCESSFUL, REBOOT NOW!". I rebooted, and the system wouldn't start!!!! ARGHHHH...
After many tries of resetting the BIOS etc, I had one chance left:
---Here's the tech bit---
THIS WAS A SUPERMICRO MAINBOARD, AMI BIOS.
I downloaded the first ROM available from the website, renamed it (to super.rom) and put it on a floppy. I Pressed CTRL and HOME whilst starting the PC, and kept them pressed until the FLOPPY was accessed.
The BIOS was loaded in and was completely successful!
The machine booted up as if nothing had happened.
I'm telling you all this because I thought it may be useful.
Does anyone know any other recovery tips for other mainboards??