My display suddenly turns off (goes black), nothing works, have to restart using power the button.

Hi all
In both Snow Leopard and Lion, it sometimes (rather rarely) happens. Specially when the system tries to use a litle bit more of the graphics performance - such as using Mission Control, opening Adobe Photoshop, using Quick Preview (pressing the space key) - the display very suddenly goes black, or turns off. In this phase, absolutely nothing works ! No sound, no response to pressing any of the keys on the keyboard, NOTHING! Not even the keyboard backlit adjustment keys (F5 & F6) do any good.
And what I do is to press and hold the power button to turn the dead device, off and start it up again.
What I did to solve this problem which didn't work at all:
1- Since the problem occurs when using more graphics performance, I reckon this might have something to do with the graphic switching... . so I unchecked the "Automatic Graphic Switching" in both Snow Leopard & Lion, but still the same thing happened a few times.
2- I did reset the P-RAM and SMC (whatever they are) in Snow Leopard. No difference !
3- I changed from Snow Leopard to Lion, which is currently installed on the device.
None of the above could solve this annoying and devastating problem.
I'm too afraid that this is a hardware related issue. If so, then any of the two graphic chipsets, or even the mainboard might be damaged I guess ?
Does anyone have seen such thing and happened to solve it somehow? I would REALLY appreciate if you could share the solution. Any kinda guidance, helping to find out the reason of this, would be such a relief !
So thank you, in advanced

Oh ! One thing I forgot to mention...
And that is, I tested the hardware twice, using Apple Hardware Test, in both quick and extended modes.
p.s.:
The "problem" happened three times in the last 30 minutes. I've been using Photoshop. Thank god everything got recovered....
I desprately need help here guys !!

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    com.apple.driver.AppleProfileRegisterStateAction          10
    com.apple.driver.AppleProfileKEventAction          10
    com.apple.driver.AppleProfileCallstackAction          20
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    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.6.1
    com.apple.driver.XsanFilter          402.1
    com.apple.iokit.IOAHCISerialATAPI          1.2.6
    com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
    com.apple.iokit.IO80211Family          320.1
    com.apple.iokit.IOUSBUserClient          4.2.4
    com.apple.iokit.IOFireWireFamily          4.2.6
    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IONetworkingFamily          1.10
    com.apple.iokit.IOUSBFamily          4.2.4
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