I have a PC with Core 2 Duo CPU and a PCIe EVGA nVidia 7600GT video. Two OSes are installed: Windows XP and Debian GNU/Linux v6. Mostly I work in the Linux. Couple days ago it started to hangs up for about 15 seconds every couple minutes. Apparently, only the X11 hangs up, because I still can hear my music being playing while the UI is locked up.
It seems something wrong with the video card... According to the nvidia-settings utility, the GPU temperature rises from 49C to 51C and I can hear the GPU fan is spinning faster.
I tried to reboot to Windows XP, and everything worked fine even under heavy OpenGL loading. Tried to install the newest nVidia drivers, but that did not help.