I have Problem sapphire 6990 HD Graphic Card My system is restarted

[P509SHO]

I am using cgminer 2.1.2   

Memory: 830 Mhz, -v 2 -w 128 -I 9, Watercooled, stock voltage.

[regedit]

Fix #1: install the latest motherboard chipset drivers
Fix #2: uninstall your old display drivers and then install the latest display drivers
Fix #3: disable your sound system
Fix #4: slow down your AGP port
Fix #5: rig a desk fan to blow into your computer
Fix #6: underclock your video card
Fix #7: do physical checks
Fix #8: test your CPU and RAM
Fix #9: check your power supply

[P509SHO]

I Already do that . I don't no What is  the Problem?

[LightningBlade]

Try and use the latest version of cgminer?