4540s Won't power up with power button.

Hi my 4540s Won't power up with power button. The power button and the 2 buttons(globe and wifi) on the far right will blink. But wont power up.
BUT, if I reseat the memory it will power up. (It's not the memory I've tried all new stick with same results) I've tried the batterty out power button down as well.
Also, once I do have laptop powered up it runs fine. If I restart laptop by clicking retstart it will retsart no probs. BUT, if I shut down and try turn back on it won't.
Little help please

This should help:
http://support.hp.com/us-en/document/c01732674
Wish you luck,
Karthik
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