I"m running Windows 7 Ultimate 64 bit version. I noticed after I installed SP1 whenever I put the computer to sleep, the disk churns away for about 5-10 mins and eventually it BSOD - driver power state failure - 0x0000009f I'e read through various posts and tried a bunch of things but nothing works. All the MS updates have been applied. Im running the latest ATI GPU drivers and all the software on my machine is up to date according to Secunia PSI. Update: Problem solved. I ran windbg and it showed that the REaltek NIC driver was causing problems. I installed the latest version and it fixed the problem

Good for you :) For more information about reading dump files: http://support.microsoft.com/kb/315263 This posting is provided "AS IS" with no warranties or guarantees , and confers no rights. Microsoft Student Partner Microsoft Certified Professional Microsoft Certified Systems Administrator: Security Microsoft Certified Systems Engineer: Security Microsoft Certified Technology Specialist: Windows Server 2008 Active Directory, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Network Infrastructure, Configuration Microsoft Certified Technology Specialist: Windows Server 2008 Applications Infrastructure, Configuration

For anyone else this may help... The above fix did not work for me, however the following did work: In the Local Area Connection Properties, click Configure... On the Power Management tab, untick 'Allow the computer to turn off this device to save power'. Now my computers can happily sleep with Windows 7 SP1.

For anyone else this may help... The above fix did not work for me, however the following did work: In the Local Area Connection Properties, click Configure... On the Power Management tab, untick 'Allow the computer to turn off this device to save power'. Now my computers can happily sleep with Windows 7 SP1. Thank you for the information: this could be useful for other users. Bye.Luigi Bruno - Microsoft Community Contributor 2011 Award