Recently my laptop froze so i reset it by holding the power button. Now everytime it starts it shuts off. It powers on for about 5 seconds then turns off. No screen shows up either. All led lights turn on then off after 5 seconds. This process just keeps on repeating. Sometimes it does not turn off but there is still a black screen. I can hear the fan and harddrive work btw. The laptop is an hp pavilion dv6000. Please help. Thanks