First thinkg I'd do is to connect an external monitor to the laptop to see if you can get an image, any image, during booting. If you can't see anything, either using the laptop's screen or external monitor, then you have a hardware failure in the laptop that's probably beyond the abilities of a novice to repair. Get somebody who knows about how to clear the CMOS of the laptop.
SOURCE: My Sony Vaio VGN NW225F laptop won't start up.
try to connect your laptop to an external monitor. if it displays on the external monitor, then your screen is bad. if it won't show up on the external monitor, then your video card might be bad. here is another idea, i don't know if its true or not, i saw a link on the internet, where is says to take out your RAM and clean it very good then put it back in and try out your laptop... hope this helps
SOURCE: My Sony Vaio VGN NW225F laptop won't start up.
I have the same problem with my NW225F and replaced the battery. Unfortunately the symptoms remain and the battery will not charge up. I have to physically reseat the battery to get the laptop to power up after a power down. I am beginning to suspect a design flaw in the power control system to the battery. Sony's "smart" battery charging system may be the culprit but I will have to put the laptop on my Bro's electronics bench and see if we can scope the problem. If I find it is a design flaw, I will announce it to the world so Sony can be accountable because they deny it is their problem as of now. Try the battery reseating maneuver and see if it fixes the startup and please post the response here so we can collect so,me anecdotal data.
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