The new lead free solder being used. While ecofriendly it is prone to cracking and since laptops don't just sit on the desk for years. So the common fix is to replace the mainboard.
If it's the OS we can test for that if the BIOS comes up by setting the CD as the boot drive and booting some CD based Linux for a test run.
The machine in question is an HP entertainment notebook, 1 gb of RAM,with an Intel centrino processor running Windows XP with Sp2. It is a relatively new machine, only three or four years old.The motherboard was replaced 1-2 years ago but has been working fine since.Recently, after losing the power cord for several weeks, I charged it and tried to turn it on. Even after trying several electrical outlets, the machine still wouldn't turn on. Another indication that this thing is dead is that the front panel, which usually lights up when you charge it or press the "On" button does nothing. I would like to know why this working machine died so suddenly and with no former warnings. Is there anything I can do to bring it back to life?