Dell Latitude C640 Notebook "turning 3 seconds" Questions

...3 seconds. The hard drive doesn't seem to be booting up nor does the fan turn on. I've replaced the hybrid cooling fan and it still comes on and stays on for 3 seconds before powering off. HELP!!! ...

...3 seconds. The hard drive doesn't seem to be booting up nor does the fan turn on. I've replaced the hybrid cooling fan and it still comes on and stays on for 3 seconds before powering off. HELP!!! My ...

...3 to 5 seconds, then shuts back off. Also, while the green power button is on, I cannot hear anything running inside my laptop. Disconnect the AC adaptor from the laptop and remove the Battery pack ...

...3 seconds then turn off. pulled anything and everything to the motherboard and it still wont turn on. got a new motherboard and still having the same problem. help me please. test power supply- test ...

...3 to4 secons it when i press power button the power and hdd indicators tun on for 1 second and caps lock light flikers for few seconds and loptop turns off.once before it gave the biose problem ...

...3. Unplug the ac adapter 4. Press and hold the power button for about 15 seconds. 5. Put the battery back in. 6. Plug the ac adapter in. 7. Turn the computer back on. The diisplay should be back on. ...

...3 seconds they shut off and nothing happens. It won't turn on whether plugged in or with a charged battery. I have tried resetting it but that won't work either. What could be causing this? take out ...

...3, reinstall the jumper over pins 1 and 2. Replace the cover and reconnect the power cable. Turn on your laptop and wait 5 seconds. Then press and hold the Power button until it turns off again. ...

...My computer turns on for 3-5 seconds & goes off. thanks That symbol stands for CAPSLOCK and lets you know if it is on or off. when the light is on means capslock is on. when off capslock is ...

...3 seconds Take the battery out of the computer.. Unplug the laptop out of power source... Press and hold the turn on key for a while... Then put the battery back in place.. Put the adaptor back.. try ...