Toshiba M645-S4050 random shutdowns

[eslam200x]

Hello everyone
i need your help all for this problem , after 2 years of buying this laptop its now randomly shutting down and powering on then shutdown .... etc in a loop , this is happening whatever i am running on battery or AC power , also whatever on Bios or in Windows 7 , if i let the laptop the battery off for 2 weeks then i put the battery again or the power it can be on for about 2 hours then the same thing happens , i opened the laptop 2 times and i removed all dust and changed the thermal paste with no luck , the fan is performing well and i think its a hardware issue and not a thermal ... i.e i think its related to bios ... and by the way once a time i let the laptop 3weeks and when i opened it i updated the bios through toshiba site but problem still there
any help ?
Note ; i have the same problem here and i tried all options of A200 with no success .

 

[Nikolay Savov]

Hi
did you run any RAM test ?
- try Memtest86 - Hirens Boot CD ( USB)
did you run any GPU test ?
- try FURMARK - under WIndows

Option 1
- you have faulty RAM
- you have faulty GPU
Option 2
- you motherboard have fault - it`s common problem that the chipsett chip are "bend off " couse of usage and the lac of the iron thechnology - the chips are more like "qlued" on the motherboard and get bend of for 2-3 yars
The last option to save the motherboard is to be performed REBOL - you need IT Service Center for that service ...