Check if the smps fan is workin...... Coz some days back i had the same problem my pc would go off after 30 mins or so but the motherboard led would glow and no display on the moniter..... so i opened it up and guess what there was a silver solution all over the processor and the fan so cleaned everything the processor,ram,fans... and found out that the bloody Smps fan was not workin thats what caused it 2 overheat...then i opened the spms and put just 3 to 4 drops of oil in the fan so that it losen up... Well its workin fine after that no problems yet....
So the Experience that i had with my pc id say its due to overheating was the prob in my case....Sorry for the long story guys thought it might be usefull to some1.......
So the Experience that i had with my pc id say its due to overheating was the prob in my case....Sorry for the long story guys thought it might be usefull to some1.......