Out of Range & No Signal Errors on LCD Monitor

Hey, This problem has only started happening recently and only when I'm playing Rift. After a while the screen goes blank and i get either a No Signal or Out of Range error and the monitor won't turn back on unless i reboot the PC.

Here's my specs...

Operating System
MS Windows 7 Ultimate 64-bit
CPU
AMD Athlon II X2 250
AMD Athlon II X2 250
Regor 45nm Technology
RAM
4.0GB Dual-Channel DDR3 @ 669MHz (9-9-9-20)
Motherboard
ASUSTeK Computer INC. M4N68T-M-LE-V2 (AM3) 28 °C
Graphics
1080A (1920x1080@60Hz)
ATI Radeon HD 4800 Series (ASUStek Computer Inc) 49 °C
Hard Drives
488GB Western Digital WDC WD50 00AADS-00S9B SCSI Disk Device (ATA)
Optical Drives
Optiarc DVD RW AD-7240S SCSI CdRom Device
Audio
AMD High Definition Audio Device

My DxDiag is attached.

 

Could be a temperature issue on the video card if this game is stressing it. Try playing it at a lower resolution, turn down AA, AF, etc., and see if it still happens.

sam