Windows won't boot after hardware update

Try reinstalling the chip set drivers. Also with that big a hardware change Win7 is seeing a new computer and you may have to do a clean install and then re-validate your product key.

your easiest option is to get a new drive (if your existing drive only has 1 partition) and install windows fresh on it, with the existing drive disconnected. you will have to reinstall all programs.

the Hard way would be to try and boot into Safe Mode, uninstall and delete all drivers, and install all the correct drivers for the motherboard, chipset, network, etc...

What type of error are you receiving?

Like Dogsnake said, you are seemingly introducing a new computer to Windows w/ the motherboard change. Do you recall if you purchased a retail or OEM copy of Windows?

You can find more information in regards to the different versions of Windows 7 HERE.

I endedupnswitiching my SATA to ACHI and my computer booted and everything seems to be working fine. Thanks for your help guys!

I assumed that was a given from the start...

glad it's sorted...