I'm starting to think this motherboard doesn't like me.

After putting the PCI modem in, everything seemed happy... However, another issue has cropped up. I bought a new case for the computer (the old case uses sliders that screw into the 5 1/4" stuff such as CD-ROM's, and I needed 3 sets of sliders and only had one). I transferred everything over to the new case, but I didn't make any hardware changes yet except for two different CD drives (a new 52x CD-ROM and my venerable old CD-RW drive) and that I didn't plug the 2nd hard drive in. This was just to test everything prior to putting the new video card (I got an ATi Raedon 7500) and new hard drive in and subsequentially starting with a fresh copy of Windows. However, BIOS isn't recognizing that anything's installed. If I have everything else unplugged, it will recognize the CD-RW as the secondary slave (which it's supposed to be); however, if I have the CD-ROM and/or the hard drive plugged in, BIOS won't even recognize the CD-RW. With everything plugged in, the system will lock up before attempting to identify the Primary Master and Slave and the Secondary Master and Slave. If the CD-ROM and CD-RW are not plugged in, it will say that nothing's plugged in at all and will get as far as telling me that there's a system boot error and that I need to put a system disk in and hit ENTER. All cables are properly hooked up, as far as I know all jumpers (on the drives and the motherboard) are set where they're supposed to be, and again, other than the two CD drives, no hardware or settings have been changed. The power supply's a new 350 watt unit; the old one was either 250 or 200, I believe. The motherboard seems to be powering up properly; my dad was thinking that the motherboard was overjuiced but I have a bit of trouble with that as the system seems to power up as expected. The hard drive does not spin up, and neither does the CD-ROM, although the CD-RW is. I tried it with the old power supply, and nothing changed. I also tried moving plugs around (using plugs that powered up other things, for example) to no avail.

I'm guessing there's a setting that's wrong somewhere, but I have no idea where, and neither does my dad (we spent the better part 4 hours last night trying to troubleshoot it; thank goodness for my $25/month flat rate in-state long-distance calling plan). I'm on my mom's computer at this point. BIOS is set up to automatically detect any IDE drives, and trying teh HDD Auto Detection does nothing; the motherboard just plain doesn't acknowledge that anything's plugged in (except, again, the CD-RW drive under certain circumstances; I need to play with that a bit, though).

Any thoughts would be greatly appreciated. Thanks in advance!!