CPU fan on GA-EP35-DS3L

I went to upgrade my motherboard and processor today from an older Asus P5N32-SLI SE Deluxe + C2D E6600 to a new Gigabyte GA-EP35-DS3L + C2D E8400. I have an aftermarket CPU heatsink, a Thermaltake something which is basically just a gigantic tower of copper fins, with screw holes to put on a fan if you need one. Its meant to be able to run fanless. Anyways...

When I hooked up all the new hardware, nothing happened. Lights went on, fans went on, but there was no POST, and no error code beeps. I thought something was fried. So I tried using the old processor on the new board to see what was the problem.

Long story short, I finally realized that the problem is the board will not post if on the CPU fan header, you use a 3 pin connector, like the one on the standard case fan I have mounted on my TT heatsink. It worked on my Asus board, putting only the 3 pin fan connector on the 4 pin header, it would just say "CPU Fan error!" on bootup and I could manually disable that warning in the BIOS. The Gigabyte however, will not show ANYTHING if there isnt a 4 pin connector on the 4 pin CPU fan header.

Is there any way to create a workaround for this? Right now I just plugged in the heatsink fan somewhere else and have a spare CPU fan that I pulled off a stock heatsink hanging in my case. I'd like a more permanent solution. If I need to buy a new fan, OK, but I would prefer it if anyone on these forums knows how to trick the mobo into thinking everything is ok. Thanks!