I have a Dell Inspiron 4150. After pressing the power button, the on indicator light comes on. After a few seconds the hard drive access light flickers and shortly after it spontaneously powers off. Nothing evers comes on the screen but this is likely becuase it doesn't get to this stage of the boot-up before the problem kicks in.
I HAVE ALREADY TRIED:
Unseating and reseating ram (I have two sticks, I have tried removing one, removing the other, swapping bays, etc.)
Removing battery, disconnecting AC adapter, holding power button down for 15 seconds, then retrying the boot up.
NEITHER OF THESE POTENTIAL SOLUTIONS HAVE DONE ANYTHING TO THE BEHAVIOR OF THE LAPTOP.
Also, the laptop is approximately 3 years old.