My laptop sudenly shut down

[lastfan]

i have a Aspire 4935G I buy it from a friend of my father he said he has used the laptop for 1 years

i buy a WD (Western Digital) Hard Disk and installed Windows 8
when I playing Game it keep overheating and sunddenly shutdown.
i try to place a fan under the laptop and it shut down again.

I have repair the laptop for 4 times and it no change
it have change the procecors to 4735Z

the Third time of repairs it cannot play games I play games it shutdown


Please help I have used 166.38USD For the laptop

i have used for 4 years

Spec

Acer 4935g

Windows 7 (I have Changed to Win7)
4 gb Ram (I buy A 1 2gb ram)
intel core 2
nvidia geforce 9300m gs
2.26 ghz
dual core
500 gb hdd


i not overclocking my laptop

Big sorry for my bad english

 

[hang-the-9]

What do you mean you changed the processors to 4735Z? That is another Acer model, did you switch the CPU in yours to one from that model? Was that done when you were trying to fix it? Crashing during games can be from a bad video card or overheating. What did you repair when you said you repaired it 3 times? Heatsinks should be cleaned and re-installed with new heat grease, seems you already re-installed Windows on it so that clears up any issues with software.

Did you try running on only one stick of RAM at a time?

Very likely you need a new motherboard for the laptop to replace the video card.

 

[lastfan]

What do you mean you changed the processors to 4735Z? That is another Acer model, did you switch the CPU in yours to one from that model? Was that done when you were trying to fix it? Crashing during games can be from a bad video card or overheating. What did you repair when you said you repaired it 3 times? Heatsinks should be cleaned and re-installed with new heat grease, seems you already re-installed Windows on it so that clears up any issues with software.

Did you try running on only one stick of RAM at a time?

Very likely you need a new motherboard for the laptop to replace the video card.

my repairs history
1:i repairs at the computer shop in 1 week the laptop shut down again
2:i repairs the fan
3:i repair the screen (my laptop screen broken)
4:i don't what to do i repair at the top up shop and after my laptop finished
repair. i try to open bios and it say model name:acer 4935z

I have Change the Motherboard
i have two stick of ram

2gb kingstone
2gb eco



at the bios my laptop say model name acer 4735Z
my graphic card is nvidia 9300m gs

i have installed the driver

and what can i do now

InsydeH20 Setup Utility REV.3.5
CPU Type :Intel (R)core (TM) 2 Duo CPU
@2.26 GHz
Cpu speed:2.26GHz
HDD Model:WDC XXXxxx XXXX XXXXXXX
hdd serial:WDC XXXXXXXXXxXX
Atapi Model Name:Slimtype DVD A Ds8a2s
System Bios Version:v1.09
VGA Bios:Nviian nb10m-GE1V62 98.5F.00.05
Serial Number:LXPXXXXXXXXXXXXXXXXXXX
Asset Tag Numeber:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Product Name:Aspire 4736Z
Manufacturer Name: ACER
UUID:


thanks for you answer!