Video problem with bootable media

I’m getting video problem with the bootable media TI 2012 home Build 6154.

I boot it, start backup, after that display is gone to sleep. The timing is varying. In worst case, it happens before starting backup. Then it’s never been backed on until power off the PC. It happens regardless of moving a cursor on the display, it goes to sleep suddenly as well.

My PC has
Video card : NVIDIA Geforce 9600 GS0
Chip set : Intel G33 chip set
Memory : 8GB
CPU : Intel Core2 quad

I have another laptop PC. This trouble never happens on it. Just desktop PC only.

Do you know how to avoid this? I have noticed this issue since TI 11 home.

Thanks,