From your description it sounds like something interfering with the fan, like a matted lump of dust and fluff rubbing on the fan vanes. If the fan is actually prevented from spinning at a reasonable speed the firmware will probably detect this and could well decline to start the computer for fear of the processor overheating.
First of all, try poking a pin through the air vents to see if you can dislodge any matted dust then try and suck it out with a vacuum cleaner. However, you will probably need to disassemble the laptop (not that hard) in order to gain full access to the fan.
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crwdns2947414:01crwdne2947414:0
Hi,
How far does it get into the start sequence,
Lights on, fan running, maker's logo, error messages etc.
Does it do this when connected to the charger?
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