Hello and welcome to Bleepingcomputer.
Lets see if I can help you in identifying your motherboard.
There are many ways to find out this information, one is to try and grab the BIOS string on the POST screen, however I realize your not able to see anything on the screen during the post.
You could try adding another video card to an expansion slot to see if the original one was is either damaged or has failed. You may be able to get the video to work and get the BIOS string numbers.
Here is a link to a web site that explains how to find possible identifying labels or ID tags on the motherboard and how to use that information to identify your motherboard.http://www.pcnineoneone.com/howto/moboid1.html
There are several pages to this page be sure to click the link at the end of each page to progress to the next page. Just ignore
the ads found in this artical and keep scrolling down to read the artical.
Hope this helps.
If not I will have to locate a program for you that will identify your motherboard for you, but in order for it to work, you will have to get the video to work first, in this case I would suggest you try replacing the video card with a known working one, either a PCI or AGP video card would be needed as I would doubt the computer even supports PCI-E, being its age means there was no PCI-E when it was manufactured.
Edited by MrBruce1959, 03 August 2010 - 11:23 AM.