Thanks for your replies everyone. I found the problem. My creative x-fi audio driver was preventing sleep. The explanation is here:http://www.quantexzone.com/index.php...es-s&Itemid=56
"Open a command console with administrative priviledges.
powercfg -requestsoverride DRIVER "Creative X-Fi Audio Processor (WDM)" SYSTEM
Verify that the X-Fi has been added to the override list by typing:
My power settings are all default in the "Balanced" profile except that I put computer to sleep to "never." However, I have a new sleep issue described in another thread here
Win7x64. HDHR prime 3cc.