Need Urgent Help Dell Xps L502X

Hi
i am using DELL XPS L502X
i5 2450m
GT540m underclocked to lowest CoreClock 355 Mhz & MemoryClock 450 Mhz
6Gigs Ram


my laptop is tripping off suddenly anytime... sometimes it runs for and hour and some time 6-7 hour... but sometime it will not even last 10-15 mins

suddenlly it tripps off without any warning

i read few online fixes and tried them all....but no luck yet... it still trips off need your help

Things i've tried so far
~cleaning dust inside my laptop
~removing dust filters
~changing thermal paste...i read somewhere that its coz of my thermal paste dried off so i cleaned old paste and applied new..

please help waiting for your responses

 

any help?

 

Buddy there are many things that could be wrong and causing 'tripping' of your laptop. If it runs for a long time but then at other times for much shorter periods it suggests it is not a heat problem, especially if you have done everything you say. Is there any pattern to it that you can see? Have you run memtest to check the memory? Performed a standard virus scan? Over time all computer components degrade esp laptop parts which generally have had more heat stresses. A capacitor might be failing or other component dying. I have an old dell V13 vostro that has survived a SSD swap, x2 new batteries and a screen replacement, but now is BSOD every 20 mins or so despite my TLC. I assume your laptop is now long out of warranty?

 

my laptop is 3 year old..... yes i did a memory dignos...it gave PASS to every test,,, and yes i scaned for virus and malwares too... currently found some power management settings.....

a guy suggested to turn my FAN settings from active to Passive... and reduce my Max CPU usgae to 85%

currently my laptop is up for 5 Hrs and hope it will not trip off again..

if it does m looking here for some proffesional support.....

coz DELL guys are asking very huge fees..

20,000 INR and saying it could be motherboard problem.. they are not sure either..
some what close to 400$