For those who are looking for a replacement for G31M-ES2L....

One morning my motherboard was dead, fans spinning but black screen, no bios, nothing.
After trying a bunch of stuff I decided to get a new board.
I got the GA-G41M-ES2L ver. 1.1
It booted with my hard drive I had set up for the g31m (10.6.4).

Only thing missing was sound. I fixed that by running AzaliaAudio.pkg from this thread at insanelymac:

Retail Snow Leopard DVD install for G41M-ES2L

The board look very similar, although my g31 board had nicer, golden heatsinks :-)