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If the laptop was opened up, (ALL power removed -> AC adapter and battery; PLUS -> anti-static precautions taken!), and the laptop has a power on switch, (under the power on button), that plugs into the motherboard; you can unplug the switch, and touch the motherboard contacts to try to turn the laptop on. (Sorry about the run-on sentence) Jump a wire or similar, across the contacts, and see if the laptop turns on. Could try to be more specific, and detailed, if you had listed more info about the Fujitsu Lifebook. Such as it's Series number and Model Number. Example: Fujitsu Lifebook E8210. In this example E is the Series number, and 8210 is the Model Number. Post back in a Comment.
Turn on as you did before and leave on for 10 minutes. Then, try turning OFF the computer by keeoing the POWER button pressed for 7 secons. If the computer goes off, then your screen is fried and the computer is actually booting up normally... you just can't see it ;)
Unplug the AC adapter from power cord, then remove the battery.Wait 30 min and put the battery back.Plug the AC in power cord and try again.If not start you need check AC adapter with voltmeter.If the AC working your computer need service.
First at boot press F8 and then in the advance option select Last known Good Configuration.
At startup press Del and then in the bios select Load Default,save and exit.[This one might or might not work]
On the Desktop...go to START--ALL PROGRAMS--ACCESSORIES--SYSTEM TOOLS--SYSTEM RESTORE and then try to rollback to previous date when the laptop was working fine.
You did not mention the Operating System you are using for Vista here's the link http://www.laptopbeep.com/fujitsu-lifebook-a6025-drivers-for-windows-vista
Download the audio driver and install.
I suppose you have realtek high definition for XP audio driver you can search through Google.