Dell 1555 studio shut down problem

Hi there .

I have the problem my on laptop, it shuts down in some games , not all.

so , it get me crazy , in those:
World of warcraft ,
the Elders scroll IV : oblivion

the Elders scroll V :Skyrim

Vampire the masquerade : Bloodlines (VTMB)

BOT NOT turned off in

Mass effect (1,2)

Darksiders II

king's bounty

it should not be temperature problem, so say's dell warranty service

i've checked.

in VTMB it's not so high (72 gpu, others lower), when it shut's down,
and Mass effect - it don't , but temperature is pretty high (94 , and it havn't turned off even once, may be now will be diffirent)

with help of warranty service i've changed my motherboard + cooling system .
ricoh card reader (there was a problem from the begining)

I have temp logs and system info in files, shortly say - it's :

win 7 professional (goes with notebook)

System Manufacturer    Dell Inc.    
System Model    Studio 1555    
System Type    x64-based PC    
Processor    Intel(R) Core(TM)2 Duo CPU     T9800  @ 2.93GHz, 2934 Mhz, 2 Core(s), 2 Logical Processor(s)    
BIOS Version/Date    Dell Inc. A08, 07-Nov-09     (bios latest..should be)
SMBIOS Version    2.5   
 

 DirectX Version: DirectX 11

---------------
Display Devices
---------------
           Card name: ATI Mobility Radeon HD 4500/5100 Series
           Manufacturer: Advanced Micro Devices, Inc.
           Chip type: ATI display adapter (0x9553)
           DAC type: Internal DAC(400MHz)

           Driver File Version: 8.17.0010.1129 (English)
           Driver Version: 8.970.100.3000

Any other info you need to solve this problem i'll get .

*sorry , if there was few text (or style) errors.

 

RAM - 4 GB. DDR2

Video - 1 GB

HDD - 500 GB (100+ free)

one of Dell specs in my country give advice to 
take it to service again an change motherbord 

BUT
i do not have tests , when comp. shuts down .

it shuts only during games.

may be you know some kind of ... how to say.....

what is the same about those games, what should I test , and how ? 
if I'll find it - half of problem will be solved.

yes, drivesrs , bios , directX , C runtime  (visual C, of course) e t.c. is installed ,just as game needs to be. 
about mem test , can you say a name of some good programs for it ?

oh yeah , it's also not a electicity problem ( i've tested also in others places,then my home , on UPS system , whatever notebook battery is good enough for it )

thanks , i'll try.

if it were in only one game - i would think - "i'ts just game error",
but in whole bunch of games, but not all, so i search and search
target is simple, but goal is still out of sight =___=

So ....

i've runned memory test for 4 hours in cycle, havn't found any problem.
 

about vacuum cleaner - don't be ridiculous. if I use it on my notebook (2300W) , my cooler will be sucked into :D

and , i repeat , I HAVE COMPLETELY NEW cooling system and motherboard .
so - there just no reason. i do cleanings time to time tough .

- no memory problem , no temperature or video... i just don't know what and how to test, except for games, to make it chut down on test,

and , i've tryed to use not main notebook screen , but connected it to other monitor - no help at all.

so... what eslse is there ? soft and CPU 
this book is damned =___= *cry*

another replacement will be , if I will be able to show problem on TESTS , not on "some game" - because - say your prays to game development , there is no technical problem.

i've changed HDD twice.. it is 3th HDD , and it is ok.
or.. it was ok , coz after so much shut downs - it can be damaged.

but it's not the case right now.

 

Yes , I have latest drivers.
there were two types of "latest drivers"
Legacy , and mobility ,as I remember.  (but I'll try link you give as well)

CPU test :

Prime95 - no problems found. core temp 76\74 °C (first-second core)

GPU tests
FurMark 1.10.2 - gpu temperature max temperature 102°C , no shut downs .
now I'll try Unigine Heaven.

on DX 9 - 10 - 11 - openGL.
for all night test... maybe ...maybe I'll find something.

P.S.Tried furmark+Prime95 both in same time. for two hours or so. no shut downs.
 

those drivers have not helped.
continue with tests.
(got answer from DELL , want me to check if system shuts down in bios , and
to update few drivers)
hope it helps.