|I couldn't find the jumper settings anywhere, only this:|
I assume you know how to set them. Are you sharing the cable with another device? Ideally, the HDD should be all by itself jumpered as Master & plugged into the end plug on the cable. If it must be paired up with another device, it's generally better to be a CD/DVD drive than another HDD. Regardless of how you pair them up. the 2nd device must be jumpered as Slave. As an alternate method, both can be set to Cable Select.
Try reflashing the BIOS to the last official release before the Beta BIOS. You'll have to do it old-school from floppies. Here's the method I prefer:
Prepare 2 floppies, one a WinME bootdisk, the other containing the BIOS file & flash utility. Boot off the WinME floppy & select "minimal boot". Once it reaches the A:\> prompt, eject that floppy & insert floppy 2. Type the name of the flash utility without the exe. In other words, if the flash utility is AWDFLASH.exe, just type AWDFLASH, then press ENTER. From there, just follow the instructions. Save the current BIOS as BETABIOS.AWD, that way you can flash back if you ever want to. Since you've been having problems, I suggest you do it with all the IDE devices unplugged.
If you don't have a copy of the WinME boot disk, you can download the bootdisk creator here:
WinME bootdisk Creator - direct download