You turn on but it won't boot to your OS? or powers on (i.e LED power light comes on) but you get no display at all, not even Lenovo logo?
If it's not booting try booting from your windows CD/DVD and running a start up repair. This is a guide for Windows 7 but should be very similar process for Windows Vista.
http://pcsupport.about.com/od/toolsofthetrade/ss/windows-7-startup-repair.htm
If you get no display at all (Not even a Lenovo splash screen) and just lights, try popping your battery out and power the system up on mains only. If this works, pop your battery back in, it should be begin to charge. You laptop should continue to work from now on. This is a problem that occurs from time to time on any laptop and is cleared this way.
If removing the battery doesn't work I would try removing/re-seating/swapping out RAM.
Let me know how it goes, I may be able to help further.
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