I looked on ebay but didnt see a direct replacement for you. Its too bad that the board doesnt work any more. Swapping the board out may not allow you to start up Windows to the desktop. Heres why. When you install Windows it looks at the hardware in your system and installs things like the controller for the hard drive. Once this is done it looks for that controller before it starts the process of looking for new hardware. If it doesnt have a controller it knows it may blue screen to an 0x0000007b error.
Heres what I would look at. Im wondering if your willing to try to repair the board. If the board has the problem that most people have it has some bad Capacitors. You may be able to fix the board by simply soldering new caps in place of the bad ones. If your willing to do this then look at the board and see if there are any capacitors that have bulging tops. If so then replace them and then the board may work again. If not, or you want to just replace the board then you need to find a board that will support your Ram processor Etc. swap it out and (assuming your using XP) try this fix to make your new system work with the old drive:

http://icompute.info/move_xp_hard_drive.htm

theres also another way as well. If you make an Ultimate boot CD 4 Windows then you you can startup the computer to that ubcd4win and within the programs menu there are some registry editing choices that if you go to you will see a program called fixboot. You should ba able to run that fix and it will allow your computer to start. If you can create or have an UBCD4win CD or USB drive then let me know and I can give you step by step instructions for the boot repair. It is simpler to do this than the article above but both could work for you.
Hope this helps... Dale

This MoBo is slightly smaller than a full size ATX form factor coming in at 305mm x 218mm (the full size standard is 305mm x 244mm). The mounting holes for ATX MoBo are standardized so, as long as your replacement MoBo is the same size or smaller, you shouldn't have a problem. The troublem may be with the vintage of the MoBo. Introduced in 2002, this is 9 year old technology. Check eBay for possible direct replacements.

You might be able to get a full size MoBo in the case if there is space along the left side (expansion slots) of the MoBo when looking down at it with the keyboard connections at the rear. The 305mm dimension is front to back and the 244mm dimension is left to right. Knowing there's 25.4mm per inch, this means your MoBo is about an inch or so smaller than a full size ATX type.

Keep in mind, you will want to match up as many of the variables as possible: CPU slot - Support 533 MHz FSB Intel Pentium 4 socket 478 CPU; RAM - 184-pin DIMM sockets DDR SDRAM slots for up to 2GB of DDR200, DDR266, DDR333; Expansion Slots - 6 PCI - 0 ISA - 1 CNR - 1 AGP - 6 USB 2.0 (you need the new MoBo to support only the types of cards installed - ISA, AGP, PCI, CNR). If you you need to purchase a new CPU, that will likely trigger the need for a new Windows license. Regardless, if you do need to go through activation again, call support when prompted and explain that the computer crashed and is being reinstalled. If they ask about different hardware, explain the replacement is for failed hardware. If you have a a non-OEM version of Windows, you shouldn't have a problem.

I hope this helps & good luck. Please rate my reply - thanks!