Kristo,
I've tried and tested the 1004d BIOS version with my A7V and T-bird 1100. I'm running a SB Live value sound card, GeForce 2 GTS 64, IBM Deskstar 75GXP 45 gig ATA100 hard drive, etc.
The 1004d corrects many of the problems you might be having. It also corrects some of the problems with the ATA100, fixes a few problems with Win98se, and allows you to set your CPU fan off or on when your system goes into standby.
Also, the original Promise ATA100 drivers are what are causing the computer to take so long to boot. I noticed this immeditately after getting my mobo up and running and installing the first versions. I had already read about this and downloaded the new ones from the ASUS website, and they cured this problem for me.
Download and install the newest ones from the link at the ASUS website. Version 1.60 build 28. There are newer ones that aren't listed at the ASUS website. They can be found at the ftp site. I'm using the 1.60 build 33 drivers now. They are working fine. Once you do this, you'll be amazed at how fast your system will boot up.
While you are there, if you haven't installed the VIA 4-in-1 drivers, get version 4.24 and install them too. The ones on your motherboard's CD have problems. There are newer versions too (4.25) but I've been reading about lots of problems with those. I am using them right now and I am having NO problems at all.
One of the problems you might be having with your SB Live sound card is the fact that it needs 2 IRQs to function if you have the SB16 emulation enabled. This is for use with DOS games. If you don't play DOS games, you can disable this and it will help free up resources and IRQs that other devices can use without having to share with others. Also, the A7V motherboard's PCI slots share resources with each other too, and there's nothing you can do about this except move your cards around to slots that aren't shared. The only PCI slot that doesn't share with another one is slot 3. So.. this would be the best for the sound card. Try to keep slot 1 open too. It shares with your AGP card. I think it's best to leave that one on its own.
All of these updates help and correct many of the problems that we have been having. It took some tinkering, but my system is rock solid stable right now.
I'm using the 1005a BIOS, but there's a few quirks in this version.
I'm running my PC133 memory at 133, my AGP at 4x and everything set at optimal.
These ideas should help you get your system up and running the way you want it.
Phil