PLEASE PLEASE HELP ME!!! I am having a problem that i thought was my HD but is not i guess. I turn on my computer then it shuts off, i took out the battery and used my adapter still then same thing, i took out the HD as well and still the same. Nothing shows on my screeen either, something wrong with my heat thing??? or fan?? then fan is ok, no heavy noises. I have a Dell 5100 only 2 years old. PLease help, from what i have read, something to do with power, or heat sink but i dont know where it is , and am not paying some one millions to do it.