I am rebuilding a 486 sx2-50 and originally built it with 2 hard drives, C drive being a 120 MB and D drive a 160 MB. I had some trouble with the BIOS detecting the drives but succeeded in the end.
I then upgraded to a single 850 MB drive, using ontrack software to partition the drive. I did this with the drive not installed into the PC. All went well and I then copied the contents of the original drives to the new 850 without problems. I then disconnected all the drives and installed and connected the 850 into the PC.
The machine failed to boot from C. All I got was the message "Hard Disk controller failure" and I had to boot from A drive.
Despite changing controller cards, positioning in different slots, re-partitioning the 850 as a DOS 540 I still get the same message.
Once I boot from A drive I can access C drive as normal so there appears to be no problem with either C drive or the controller card, but if I go into the BIOS and autodetect the hard drive it takes upwards of a minute to detect it. If I reinstall the old drives the BIOS will not detect them.
Also if I try to run the ontrack software to partition the 850 drive it reports that there is no hard drive.
Do I have a hardware problem with the BIOS or motherboard or have I missed something?