rgd1101 :
did you update the graphic driver recently? what the make and model of you psu, exactly why don't you post the full spec.
I have updated the graphic driver.
Specs:
Operating System: Windows 7 Professional 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.130708-1532)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: BIOS Date: 11/14/12 10:30:51 Ver: 15.03
Processor: AMD FX(tm)-6100 Six-Core Processor (6 CPUs), ~3.3GHz
Memory: 8192MB RAM
Available OS Memory: 8174MB RAM
Page File: 4395MB used, 11950MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: None
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 32bit Unicode
Card name: AMD Radeon HD 6800 Series
Manufacturer: Advanced Micro Devices, Inc.
Chip type: AMD Radeon Graphics Processor (0x6738)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_6738&SUBSYS_31071682&REV_00
Display Memory: 4095 MB
Dedicated Memory: 1011 MB
Shared Memory: 3084 MB
Current Mode: 1440 x 900 (32 bit) (60Hz)
Monitor Name: ViewSonic VA1948 SERIES
Monitor Model: VA1948 SERIES
Monitor Id: VSCE827
Native Mode: 1440 x 900(p) (59.887Hz)