MSI 875P FISR2 not recognizing cd-rom discs

I'll start off with "everything was working" before I started sleeving my power supply (which I am now regretting). I am at work now, but will provide as much detail as I can. Any suggestions are welcome.
Anyway, after putting everything back together, I have some problems with my Lite-On DVD/CD-ROM and also my CDRW and floppy drives. After booting up and getting into XP Pro (w/service pack 1), the cd drives and floppy don't seem to recognize a disc when it has been put in. When you put something in one of these guys and drill into it via Explorer, I get the message "Please insert disc." BIOS recognized the drives and XP seems to see them (the icons show up in my computer). However I didn't check the device manager in XP. The strangest thing is that if I leave a cd in the drive and boot up, everything works fine. Auto-insert works and fires up the cd, and I can drill down into it's contents, etc. Everything seems normal.
Here is what I have tried so far:
- tried another IDE connection
- made sure all cables and power connection were seated tightly.
- tried just using one device hooked up a time (and set to master)
I am completely baffled by this and would appreciate any thoughts you might have. I ran outa time last night, but what I plan to do tonight is hook the drives up to my other computer and see if they work correctly there as well as hook another cd player up to the new machine and try it. I guess I can also try another IDE cable, but again, the cable seems to work fine if you boot the pc up with the cd in the player.
I think I have a spare power supply I can even try, but I just can't imagine that this is the problem (although it is the one thing that has been changed). I mean, everything is getting power....
Here is what I can remember about my system:
MSI 875P FISR2
Intel 2.8 P4 800mhz FSB
Kingston DDR400 (1 gig)
PixelView (NVIDIA 5900) grahpics card
Enermax EG365P-VE (350 watts)
Western Digital 120 gig SATA drive
Bios version 1.4
Lite-On DVD/CD-ROM
Dell CD-RW
XP Pro w/service pack 1

Hi strummer2k,
If your using the MSI round cables then they will be Ultra 133 straps but there are two types, the 40 pin ones which will limit it to DMA 33/66 and the 80 pin ones which will enable ULTRA 100/133. I'm surprised how many people arn't aware of that and I recently did a small contract for a Computer Hardware shop in the city and the guys there were suprised when I showed them the differnce, it can boost performance quite a bit. The other important thing is to go into device manager and select your IDE ATA/ATAPI controllers and select you Primary & Secondary IDE Channels and right click one of these at a time & select Properties/Advanced settings.
You will need to have the correect straps for the following to work:
You will see a setting which says PIO Only or DMA if available - select DMA if available, do the same with the other channel and reboot and you will be running Ultra DMA for your drives. If you have an older CD Rom that doesn't support Ultra DMA & is on the same channel as another drive then it will only run at PIO on that channel. Im using W2K and I'm guessing that XP is still using the same functions?
This is going to make your hard drives run a lot faster as well as they will be using one of the channels, most likely Primary.
Some
bios's have settings that can enable/disable this as well

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MSI 875P FISR2 not recognizing cd-rom discs

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