PC powering off when Video in Browser if Adobe Flash used...

Hello.
My PC may randomly power off when using adobe flash video in browser.
Similar topic:
http://forums.adobe.com/thread/1258555
a) Temperatures in system are OK.
b) System survived multiple stress tests. Some were focused on PSU, some on CPU, other on memory and other on graphics.
c)Tested on:
Opera 12 and 20
Browsers were either playing Flash, with chance to power off. When uninstalled Opera requested Adobe Plugin automatically on Youtube.
Internet Explorer 11
If Adobe ActiveX not present, videos on youtube were played via HTML 5 without trouble. When ActiveX installed there was still no trouble, but since I have AMD graphic card, IE requested to enable "AMD steady video plugin". Once enabled there is still some chance to power off the PC.
Catalyst settings:
When AMD steady video is not installed, or is disabled the chance for this behavior is still here.
If installed and enabled, system did not crashed due this.
I tried latest Adobe Flash 12, and previous 11 are causing this. I tried older Catalyst (13.12), and behavior repeats.
Event log:
Empty. it literally looks like when somebody pulls the plug out.
GPU behavior:
Usually last observed thing is that GPU clocks to full frequency for a while, and then to "video frequency" of 501Mhz.
Other behavior:
This behavior is more like to happen when PC is "freshly booted". The longer is running, the longer it took to power off.
The symptoms are confusing to me. The issue is surely at least partially HW related, but bound only to Adobe Flash. No other HW accelerated video codec is causing similar behavior (at least until now).
On the other hand, its clearly bound to Adobe Flash 12 or latest 11, and some Catalyst settings.
Can you recommend me Adobe Flash version which is not using Amd Steady video at all?
Thanks.

Thanks for reply.
a) System passed all stress test, whether graphical PSU, memory or CPU based.
b) Its powering off only when using Adobe Flash player in browser.
I confimed that only Adobe Flash in any browser i tested is causing failure, but I re-think again what components are included in the whole chain. This was happenning even on stock frequencies and voltages, but...
(Data stream arrives from NIC, is transferred to RAM, then CPU picks it up, send it to GPU for (HW accelerated) decompresson , then back to CPU where browser start to manage the data and then back to GPU for displaying)
a) CPU Core failure would cause BSOD, because I have 5 other CPUs to handle the event this way.
b) GPU, NIC or Sound card failure will also lead to BSOD - CPUs will remain active...
c) Memory failure will also lead to BSOD...
There is but single part of my PC, which can cause "Instant Power-Off" symptom. Its Northbridge/L3 cache.
Even when the Stock settings were causing exactly same symptom I focused on manual Bios settings. Yesterday evening (rather today early morning) I found configuration when Flash was stable.
Its not overheating, rather than overload of Northbridge/L3 cache. The amount of transactions between all devices must be tremendous... Therefore I had to customize CPU/NB settings in order to keep Adobe Flash stable. (slightly increase of CPU voltages +0,02v on CPU, 0,05v on NB when compared to stock).
For now I have to re-test those settings for few hours with Flash, and later with stability tests.

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