? It changed the boot order and now its trying to boot from the IDE drive instead of your normal boot drive? Maybe?
-Make sure it's booting the OS from the correct drive.
Most IDE drives have a Jumper, it must be set correctly to Slave\Master or Cable select. The cable select sometimes doesn't work. Also try using the ribbon's other connector.
Try changing the board to IDE compatibility mode.
It's running the HDD in ATA-133 mode when it's really a slower one like 66 or 33? Maybe? A way to force the board to drop to the slower speed is to use a IDE cable for a CD-rom. If you look at the cables some have more fine wires and some have less wires that are thicker. The older slower cable has the thicker wires. Using that cable will force all IDE hdd's to the older slower speed. The bios might have a setting so you can change between the IDE bus speeds but many do not.
Maybe it's formatted with something else that Windows can't read like Linux, Apple\Mac. Try a bootable Linux stick or CD. Most let you start the OS without installing it. I had luck with putting the drive on it's side and turning it quickly when i started the computer. Putting the drive in the freezer is known to sometimes work. I had luck with just getting mad at it and throwing it on my bed, it bounced and then after when i tried it and it worked. HDD's are only supposed to be opened in a special clean room, many have a sticker you can peel back and manually unstick the drive head. Then put the sticker back on. This will ruin the drive because now you have dust in it. Even a few seconds is enough. The dust is massive to the drive head clearances. They are not supposed to be thrown or dropped either. IDE drives and older SATA ones are pretty delicate and finicky.
If the HDD is really old and smaller than 2.1gigs, many of these early drives had to be manually set up. Most of these list the cylinders\heads\sectors on the drive. These early drives were extremely fragile, if it got dropped enough to break a egg, then it's likely damaged.
The Drive maybe was used in Raid-0, so it's 1/2 of a complete drive pair. IDE drives were about as slow as a cheap USB stick so it was common to run two of them together in raid-0 to double the speed.
I dunno it's about all i think of. It made me appreciate modern SATA HDD's, USB sticks,Micro sd cards and SSD's. I forgot how unreliable and buggy those old IDE and early SATA drives really were. And Noisy and shook your computer too.