Won't boot up - sleep light blinking 3 times

Hi - I have a macbookpro - it suddenly shut down and now won't boot up. When I press the power button I hear the hardrive make a noise " tzz tzz' then nothing - except the sleep light is blinking 3 times a second every few seconds. - I've tried taking out the battery and holding down the power button - taken out the RAM - nothing.
and of course my 90 day warranty ran out last week -
Help gratefully appreciated....

Hi - Thanks for your reply, I had a look round the net and found that diagnosis - I don't think it's applicable to me as the machine was up and running to start with. My girlfriend was ill in bed and watching a dvd - could this have overheated the machine and are the 3 flashes to do with this? I've since found this
http://static.scribd.com/docs/1ek00bgxjmm4u.swf?INITIAL_VIEW=width
which says it could be down to overheating - if so is there a way to reboot or is it a trip to the mac store ??

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