Video card hangs the X11

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.

Any thoughts?
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zc2Asked:
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joinaunionCommented:
Sounds like a power issue to me.

Whats the wattage on the power supply for the computer?
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zc2Author Commented:
It's 450W. If it's a hardware issue why Windows works fine?.. I
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zc2Author Commented:
Tried to boot from a liveCD, works fine. Then I changed the xorg.conf, instead of the "nvidia" driver I put the generic one "nv". No lock ups yet. But now only one of my two monitors is operating. So, that's not a solution.
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zc2Author Commented:
I've requested that this question be deleted for the following reason:

Although there were no signs the issue had hardware roots, but it actually has. The videocard has opened blew out capacitors and that obviously was the cause of the malfunction.
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joinaunionCommented:
So it was a power issue?
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zc2Author Commented:
Let's define the "power issue".
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joinaunionCommented:
Umm,blown capacitors means no power. Meaning Power Issue.
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zc2Author Commented:
Well, makes sense.
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zc2Author Commented:
My comment contains the explanation what exactly happened.
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