system crashes at 1440*900

hello everyone.
i m having this weird problem where, the moment i set my screen resolution to 1440*900 (or anything close to 8:5 ratio), my system crashes, the screen goes blank except 4 a thin white line in the corner and remains this way no matter how many times i reboot. my only option then is to start in safe mode and restore the system to an earlier restore point.
i m using a rig comprising of:

- ASUS M3N78-EM motherboard
- AMD phenomX4 9950 processor(64 bit)
- NVIDIA 8600GT 1GB graphic card
- 2GB RAM
- 500GB SATA2 hard-disc
- Samsung SyncMaster 920NW monitor ( with 1440*900 as native resolution)

the rig runs fine on all other resolutions except on 1440*900 and 1280*768. the only problem is that all the images appear to be stretched, which is really annoying.

i have used windows XP 32bit, vista 32bit and windows7 64bit. the problem is the same in all operating systems. i tried using the NVIDIA drivers that came vid the card and even tried downloading the latest compatible NVIDIA drivers from NVIDIA website. nothing helped.

i know the problem isnt in the monitor or the graphic card as i have tested them on several other systems and they work fine there.

pleeeeeeeze guys, i need help. m at the end o the road here. i dont know wat else to do.

thank u

thanks gladson1976 :)
but the thing is, i never installed any monitor drivers. i didnt get any drivers along vid the monitor.
and i just tried the driver from ur link, the problems still there

but thanks anyway :)

Do you have another monitor to try?

@DeaconFrost
well i tried the graphic card, and HDD on diff monitors. also i tried connectin my monitor to other systems vid my graphic card. ive tried all possible combinations i could think of, except one thing. except using my motherboard on a diff monitor/system

@gladson1976
as i said b4, i've already tried windows Xp and vista. the problem remains the same in all OSs

Check optional Windows Update for newer drivers.

What power supply do you have? If you don't have a powerful enough Power Supply it could cause this.