Video problem. have a acer 4010 laptop, boots up fine, but but after about 30 to 60 sec, the lcd

Question

have a acer 4010 laptop, boots up fine, but but after about 30 to 60 sec, the lcd goes black, only see dark, but when shut down with on-off button, get a slight light in backlight, before shutdown, have also done this with external monitor, still the same, have check ram by removing and clean contacts, still no go,