It's old enough to have failed (2005 laptop) but did you replace the CMOS battery and give it another reset?
I've noted the routine at my sticky in another forum. Link follows.
http://www.cnet.com/forums/post/30c241c5-dd8b-4d73-b08d-c6e15897fe5f/
Many laptops have a reset feature. Some don't but as not all machines have it, here's something to try when a laptop won't start. Remember this is generic, doesn't apply to all machines but when faced with a non-starter dead laptop, why not try this?
Ready?
- Remove all connections to the laptop. (USB, power, etc.)
- Remove the battery.
- Press and hold the power on button for 1 full minute.
-> Explainer. Yes, many machines only require 10 or 15 seconds but this reset instruction is generic and I've found people hold the button for 9 or 14 seconds so let's write the full minute. - Let go of the power on button.
- Slip in the battery pack.
- Plug in the power to the laptop and to the wall.
- Do not plug in any other devices.
Try the power on button!