Windows 7: viewsonic LCD is not working with window 7

as the title mention, my viewsonic LCD is not working with my copy of window 7. i dont know why. i have tried with my old samsung CRT, both of the DVI (using DVI-VGA converter) and VGA outout is working perfectly, but i cant get my LCD working. when i boot from safe mode, the LCD working. could it be my gfx card problem? here is my system spec. hope to solved this problem soon.

OS: MS window 7 ultimate 64bit
window version: 6.1.7600 build 7600
processor: Q6600
mobo: gigabyte GA-P35-DS3
mobo bios: F14 (latest)
GFX card: palit HD 4870 sonic dual version (512mb)
GFX driver: 9.12
RAM: CORSAIR DOMINATOR 4G DDR2
HDD: WD 320G
PSU: CM 650W
OUTPUT:
1.VIEWSONIC VX1935WM
2.SAMSUNG 107T



thanks in advance..

Hi FairCold and welcome to Windows 7 Forums

Since your LCD monitor is working when you boot into safe mode, that eliminates hardware. It is probably a driver issue or, more likely since your CRT works, a settings issue. What refresh rate have you got it set at? There is generally no need to drive an LCD monitor at a higher rate than 60Hz. A CRT, on the other hand, can work upto 150Hz (depending on model and resolution). If your refresh rate is other than 60Hz, try setting it to that frequency and see what happens.

thanks mate. its working. thank you very much..