I have a Acer aspire 5742 i5 processor. my laptop screen wouldn't work when i turned it on so i checked screen with another screen that would work but it wouldn't work also. i also though it was a motherboard issue but when i purched a new motherboard it didn't solve the problem. everytime when i start it up the screen would be black and everything would power on but the laptop would only last for about 2 mins or so and then shut down. i was wondering if the problem could be the cpu?