Dave Stevenson wrote:
... I think I'll return the motherboard and get something with nVidia instead of ATI.
Just wanted to report that fc7 64-bit is up and running now. I replaced the ASUS M2A-VM HDMI motherboard (with ATI SB600 south bridge) with an ASUS M2NPV-VM (NVIDIA nForce 430 south bridge), and the problem is gone. The two motherboards are very similar in features and price, just different chipsets.
Thanks again to everyone for your help. Dave