about once a day my computer locks with a DRIVER_POWER_STATE_FAILURE BSoD with stop code 0x0000009F. then does a minidump and reboots just fine. i have tried uninstalling and reinstalling various drivers and ran a chkdsk /r but this still happens. any ideas on what is causing it? I will include my two latest minidump files for reference. I am on an HP e9200z with AMD Phenom II X4 945 processor, 4 GB of RAM running Windows 7 64-bit. any help would be GREATLY appreciated.