hi have a look at this sites tutorials>> http://www.sevenforums.com/tutorials/?filter[2]=Power%20Management
i would set the power settings to default then reboot then change power settings to your choices reboot then see if that helps
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My Computer
Computer Manufacturer/Model Number
packard bell IXTREME M5722
OS
Operating System : Windows 7 Home Premium Edition 6.01.7600 SP1 (x64)
CPU
Processor : Intel Core 2 Quad Q8300 @ 2500 MHz
Motherboard
Mainboard : Packard Bell (Acer EG43M )
Memory
Physical Memory :8GB Corsair4x 2GB 800MHz C5 DDR2
Graphics Card(s)
Video Card : XFX 6700 AMD
Monitor(s) Displays
Maestro 234DL - BenQ V2220 - BenQ VW2420H
Screen Resolution
Current Display :1920x1080p pixels at 60 Hz in HD LED
Hard Drives
Hard Disks : WDC (1000 GB)
Drive C: (Hard Disk) : 428 GB available on 491 GB
Drive D: (Hard Disk) : 426 GB available on 492 GB
SAMSUNG spinpoint HD103SJ 1000.2 GB
(X 2) KINGSTON SSD NOW V 30GB
PSU
XFX ProSeries 550W PSU
Case
PACKARD BELL IXTREME
Cooling
System Blower Current: 150mA Air Flow16CFM ;Akasa 90mm rear
EXTRA COOLING>(FAN CONTROLLER) PC Bay Cooler 3 x 40mm fans; Akasa AK-HD-BL Blue hard drive cooler 2 x 40 mm fan 4500 rpm 29.7 dBA
Bios> American Megatrends Inc.
Version : P01-A1
Date : 08/31/2009
EXTRA COOLING>(FAN CONTROLLER) PC Bay Cooler 3 x 40mm fans; Akasa AK-HD-BL Blue hard drive cooler 2 x 40 mm fan 4500 rpm 29.7 dBA
Bios> American Megatrends Inc.
Version : P01-A1
Date : 08/31/2009
Are you sure it's not the monitor itself shutting off? I know a lot of modern screens have 'power save' modes and shut off the screen, but I don't think they go off when there's still input from the computer... worth checking the screen's menus for though.
My Computer
Computer Manufacturer/Model Number
CreepinJesus Mk. IV
OS
Windows 7 Ultimate x64
CPU
Intel Core i5-2500 3.3GHz
Motherboard
Asus P8H67-M PRO
Memory
8GB DDR3 1333MHz
Graphics Card(s)
On-board
Sound Card
On-board
Monitor(s) Displays
Samsung SyncMaster BX2250 22.5" LED-backlit LCD
Screen Resolution
1920 * 1080
Hard Drives
OCZ Agility 3 120GB, SATA-III
PSU
Thermaltake Toughpower Grand TPG-650M
Case
Lian-Li PC-A04
Cooling
Standard fans. They blow.
Keyboard
Logitech K360
Mouse
Generic Logitech from the bargain-bin by the checkout
EXTRA COOLING>(FAN CONTROLLER) PC Bay Cooler 3 x 40mm fans; Akasa AK-HD-BL Blue hard drive cooler 2 x 40 mm fan 4500 rpm 29.7 dBA
Bios> American Megatrends Inc.
Version : P01-A1
Date : 08/31/2009