BSoD during GPU-intensive session

[Berbe]

[UPDATED] No boot (was BSoD during GPU-intensive session)

My preliminary analysis ended up with:

BUGCHECK_STR:  CLOCK_WATCHDOG_TIMEOUT_8_PROC

DEFAULT_BUCKET_ID:  WIN7_DRIVER_FAULT

So a driver appears to be faulty... but how to know which one? One can list them with

lmntsm

as your tutorial explains, but that does not help me through...

It is the first time I have this specific BSoD.

Fortunately, I have both minidump + 500 MiB full dump (RARed to 100 MiB). You will find the first as attachment.
I read somewhere else than minidumps were not providing enough information for that kind of errors.
Do you have a preffered method for sending full dumps?

 

[Berbe]

Next step...

Now my laptop won't boot anymore.

Blank screen at startup, no HD activity LED. Numlock and Capslock LED are constantly lit (no blinking).

After deconnection of the fan cable (all sources of power removed), the same situation reappeas, only with Numlock and Capslock not lit anymore.
But if I hold the power button to force it to shut down and start again, the LEDs come back fully lit.

I cannot seem to find my way around the Ctrl+Home keys combo to force a flash of te BIOS.

Is my motherboard dead for good? -_-'