That's really strange. Windows 98 shouldn't support a SATA disk at all.
Of course, nobody on this forum nor anybody at Dell can look at your system to see what's on its disc(s) and (try to) understand why it does what it does. And nobody but you knows how you transferred the contents of the old ATA drive to the new SATA drive.
So I'm afraid you're on your own.
Luckily, it seems you still have your ATA disk. Why not keep that as a bootable disk while using your brand new SATA disk for storage only?
If I were you I'd boot from a GPARTED disk to have a look at the situation.
Hope I can get some assistance here as this is far beyond anything else I've encountered.
I'm upgrading a computer system from ATA to SATA drives (more complicated than that, if and when you require additonal information I'll be happy to provide as much technical detail to assist you!)
I have a SATA drive 600 GB WD Raptor brand new with my old ATA drive ( filled up 250 older GB drive with many partitions to letter V), transferred to it (it has a BSOD error for another reason when the transfer was done to save the data).
Upon reinstalling back in the computer and turning on instead of my usual four system Microsoft menu (four XP systems on the drive so solution can't be to erase a partition and do a parallel installation by the way as I have fully four OS on the drive) I saw something from my long long ago past, the Windows 98 SE logo saying that there was "no keyboard and no mouse" attached.
I worked hard to get workaround and finally got a keyboard attached (older wired style to USB) which managed to trick the program into proceeding to the next screen. It now says "click" ok to proceed. And guess what? There is no keyboard control, no mouse control because it may appear that the only thing to work on the computer is the old style PS/2 type of round connectors! The new computer with both ATA and SATA connections on the MB, has only USB (2.0), while my older computer had only PS/2 with ATA controller card. Windows 98SE does not recognize USB until it is loaded and I can't get to the loaded page without clicking "ok" and I can't get the arrow to move. I even tried my old PS/2 keyboard and mouse with modern-day adaptors (belkin and staples) to convert to USB and the drivers of course do not load until the program loads and Windows 98 does not have the basic requirements to operate anything until then!)
And the purpose of all my efforts is of course is to get the Windows 98SE to operate for a few minutes, long enough for me to re-upgrade back to my XP Home Edition (no disrespect to my old 98, but I upgraded all my 98's to XP's long ago.
Which brings me to why this is occurring....I'm at a total loss but again I'm trying to restore my four XP systems with over 150 programs (most of which can't be reloaded as they have propritory information/data storage or product keys that the websites have gone done in the years since, so reinstalling is impossible!)
One more curious bit of information you should know, and no one warned me back in the 1990s' or 1980s not to do this, I only have one "full" microsoft edition, Windows 3.0! Everything else (3.1, 3.1.1, WIn 95A, B, C, 98 and 98SE and of course XP Home Edition are all the upgrade versions, so this is complicating things. I did not install or make any partiitons without assistance of others or Partition Commander 10 etc. so they all were functioning when this original problem occured. The question that no one at Dell (the maker of the current circa 2007 computer) is able to fathom why, is why it would drop back down to Windows 98SE?
Let me know if I left out anything. I checked out a number of items on this forum and found interesting items. Long ago, Microsoft alerted me to the "memory" problem of older OS's so while I had 4GB SDRAM fully loaded on the 2007 Optiplex 320 Dell computer, I reduced it to one of my older 1 GB chips while trying to fix the BSOD problem caused by inaccurate Dell manual information.
Thanks for reading this far everyone! I really apprciate the help and advice!