Powerful Gaming Notebook shuts down during gameplay

Usally begins with a flicker or a bit lag, and then within 3 seconds after that the screen goes black, and after the screen goes black the notebook shuts down.
Happened with many games already.

some help will be greatly appriciated.

Im running games on a MIS GX740 notebook with a i5 CPU, and a ATI HD5870 graphics card (1gb ddr5 vram).
i got 4gigs of ddr3 ram.
newest ati video driver.

thanks :)

EDIT: i have a game called timeshift, and it lags terribly, even when the game should run normal on my PC. but i tried re-installing the game dead space today, and im experiencing the same lag. This sucks real heavy, because i played dead space before on the same notebook before it crashed some time ago, and it ran real smooth.
EDIT2: shit, split second does desame to me.

Could be a pooched cooling fan. Do you
have any other programs that require heavy
lifting by your cpu or graphics card. Avivo
Photoshop, that kind of thing. Run them and see
if one or both cause your laptop to shut down.

rvbfan said:

Could be a pooched cooling fan. Do you
have any other programs that require heavy
lifting by your cpu or graphics card. Avivo
Photoshop, that kind of thing. Run them and see
if one or both cause your laptop to shut down.

no i dont run any other apps but games on this machine.
it has gone worse, after 1 minute the pc shuts down now when playing a game.
please help...

but i did a re-installation of windows and the lag is gone now.

here is a CPUZ log, made by me.
GX740.html

Marinoprpic said:

I guess you should stress your hardware by playing a game and then you should test the temperature od the CPU and the GPU.

but how. since it shuts down....

If you haven't do so already, make sure your DX files are updated.

You might want to give my Tips on Troubleshooting Game Issues a look....

5 - Update your Direct X files - Contrary to popular belief, just because Windows 7 is DX11 capable doesn’t mean it has the latest DX9 files!!! Most game issues can be fixed by simply updating the DX files

BTW I love Time Shift. Great game, no issues.

i have the latest directx. but seriously do you really think the PC would shut down with every game when playing a minute to 5 minutes, because DX is not up-to-date?