dell inspiron 600m laptop wont poweron, three LEDs blink

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I googled alot but I couldnt get the answer for this issue. The Dell
laptop (inspiron 600m) bought in 2005 worked pretty well. Now its not
booting, the three LEDs above round power-on button blinks for few
seconds and goes off. I showed it to the local laptop repairer, he
couldnt fix it and with some debug circuit board attached everything
works perfectly and errors are not found.
When I googled , there are many such problems with out final answer.
Some quick answers which wont help are:
1) Replacing the memory
2) Taking out the battery recharging with some other laptop and
keeping it back.
3) Replacing heat sink/fan
4) Checking for the loose soldering connections.

Funny part is laptop boots up sometimes and then on reboot it gives
This is achieved while constantly holding the round power on button.
There are numerous posts about the same problem. And it is known
I was just wondering any known final solution?


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