Msi ge620 instability/won't turn on

Question

Hello,
here's my story and i hope someone can help me out!! because ITS VERY COMPLICATED! and i cannot diagnose the main issue!!!!!
i have been having an issue with my msi ge620 for almost 3 months now, at first i thought it was a heat problem ,and then i started to believe its an electrical issue .and now i think its the motherboard dead or dying .. but sometimes my notebooks turns on and can work normal and get into games but might turn off after 10 min or 1 hour gameplay despite that the heat doesnot pass 85C , but usually in winter is less than that
my current warranty is invalid and 2 years already passed this summer, because i bought this notebook from kuwait , and i am currently in egypt, i couldnot send it back to msi for maintenance via shipment in order to check the issue,
because firstly i dont know how exactly to send it back there or to europe etc..
and secondly cairo is not a safe place to do so..or to search etc and to ask around despite that i asked most technician or electronic shops and i am not certain if there is msi in egypt !? ,, and i dont want to handle my laptop to a technician here because i had alot of problems with them and especially stolen hardware or replacement of hardwares without notifying me .. and especially with gaming consoles..
and thirdly i couldnt travel back earlier this year because of university etc,, anyways it doesnt matter because i already opened the notebook so i thought of seeking help here from experienced people.
this whole issue started when i was playing guildwars 2 suddenly during the game my pc shuts down, so i realized it was a heat problem and then
i did some googling early that month and believed it was really a heat problem especially that i could see dust inside the fan and couldnt reach it with my electronic vacuum and was worried about the warranty if i opened it but latter that month i realized i couldnt send it back or travel etc.. so i have opened it and  started cleaning it and of course it was full of dust, and i did it by carefully watching videos and reading guides etc,,, and i am certain i did it correctly it worked perfectly afterwards with no issue at all FOR ANOTHER MONTH~! and also to note that i used to open my old desktop and replace parts or cleaning it but never did it before with laptops
and that made me realize it was a heat problem
and then later that month the issue reappeared so i went to clean it back again and it worked fine but afterwards it reappeared AGAIN and started to shut down! but this time when i opened it , it had no dust at all! so i gave it a rest, and i realized my pc was shutting down only after 6-8 hours of gameplay! and i have to mention its hot here , but i usually play with my home fan on or with my air conditioner on to cool the room
so i started giving it rest each 2 hours, and then one day it stopped responding and it wont turn on and i knew this would happen sooner or later..., so i didnt use it for a while maybe 3 days or so ,
and the next day it started again after holding shut down button for 30 second!!! i was really starting to get angry, so i did google search and i found that some guy had the same issue as me and when he replaced his electrical cable cord it worked normal, so i started to check how i can order from outside for replacement particularly from usa.. and i found a company called avadvancemax and rakkuten and also amazon that has a replacement for my discontinued msi product but the problem it kinda takes over a 1 month for the order to appear in egypt and i am certain that it will take longer with whats happening in the streets, so for the last two weeks it appeared that i cannot order from outside for certain issues , so i started to try to repair it until i can place my order for replacement,
this is what i have tried so far and it kinda worked out well but for a while only
hold power button for 30 seconds. and this brought my notebook back to life
remove power plug for 1minute  then try again
remove li-on battery for 1 minute then put it back in
start the notebook by battery and then put the plug in and it worked
play with battery only or use laptop with battery only and recharge with cable cord
and this made me believe it was electrical problem , especially that my plug looks like one from UK  which is usually used in kuwait and i convert it to european standard plug which is used in egypt
BUT! it only works for my notebook if i want to use the internet or watch videos etc,,, IF i decided to play a game such as the last remnant it shuts down, but if i play a very old game like final fantasy vii it works without shutting down .
and yesterday i played the game such as last remnant for almost 45 minute to 1 and half hour in very high graphics despite that its 2009 game and then it shuts down ,
i also bought a cooling pad just recently and started using it whenver i used the notebook , and notebook fan inside is working perfectly
 and i also thought of replacing thermal paste but i am not sure if that will help since it wont turn on , and i am not sure if formating the pc would help, since it usually starts and shuts down on windows logo but now it wont turn on at all
and what made me post this today after all this experimenting and instability etc.... ,
is because;
today i tried to start my notebook from the battery and it wont start all and neither from the main cord plug
and when it starts its shuts down very quickly less than seconds,, it used to happen before but usually it would start if i used the battery only!
and now when my battery is plugged in , and the cablecord is also plugged it , it seems that the battery is charging ... 
i am really sorry for the long post but anyways as you can see its really weird and complicated issues, and i never overclocked it but i usually play in high graphics etc.. and maybe it consumed too much power from nvidia perhaps ? i usually use it for maximum graphics and sometimes i use it for high performance only
i cant specify my notebook nor  i can get dxdiag because my pc wont turn on but this is my notebook copied  from  msi website
CPU   - Intel® Core™ i7-2630QM Processor (6M Cache, 2.00 GHz)
OS   - Windows 7 
Chipset   - Intel® HM65
Memory   - DDR3 1066/1333 MHz
LCD Size   - 15.6" Full HD (1920x1080) or HD (1366x768) LED backlight
Graphics   - Nvidia GeForce GT 540M  + intel video card integrated
Graphics VRAM   DDR3 1GB
HDD (GB)   500GB / 640GB / 750GB
Optical Drive   Blu-ray / DVD Super Multi
Audio   7.1
Webcam   HD type (30fps@720p)
Card Reader   SD(XC/HC)/MMC/MS(PRO)/xD
LAN   10/100/1000
Wireless LAN   802.11 b/g/n (Intel or Atheros)
Bluetooth   Bluetooth v2.1 + EDR
D-Sub (VGA)   
1
HDMI   
1 (v1.4)
USB 2.0 port   
1
USB 3.0 port   
2
Mic-in/Headphone-out   
1/1
Express Card   
N/A
Keyboard   
103 keys
AC Adapter   
120W
Battery   
6 cells
Dimension   
383 x 249.5 x 37.6~32.3mm
Weight (KG)   2.4
*** note:
the same issue happened to my xbox 360 and it completed wont turn on and the issue by then was the cable cord , and then it worked out well after i replaced it and afterward my xbox 360 died... despite the new cable cord
and another note is that here in egypt and especially before the military coup that happened, usually the electricity here turns off suddenly and it really made me worried that it caused both my pc and xbox to fuse .. because they both faced the same issue..
and i never had this kind of issue in my 10 years old desktop in kuwait which is really making me believe its electricity issue
or maybe motherboard died..
and thank you in advance!

Answer 1

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hello? firstly why i cannot edit or delete posts?
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now after the testing, i noticed my laptop won't turn on even with  the battery only and doing the 30second shutdown rest
you mean its doing at his own 30 seconds On, then shutdown for 30 seconds and repeatable in that way?
that hapends if you use battery only?
or its doing the same if you leave ac charger only?