Macbook pro doesn't start after a long time of inactivity

hi,
MAC OS doesn't start when I switch on my macbook after a long time of inactivity. The HD seems to turn, the non activity led is on but nothing on screen.
I have to switch off the machine by pressing the start button during five seconds and then switch on again to launch MAC OS without problem.
the problem doesn't appear if the macbook has been switched off for a short time and only appears after a long time of inactivity
I dont'know if their is a hardware problem? can somebody help me?
macbook pro Mac OS X (10.4.6)

hello,
I have a the problem when the MBP is in sleep mode too for one hour for example. It doesn't wake up and the behaviour is the same as a power on.(power ok, hd turns , blank screen, activity led on, no launch of MAC OS)
I call apple support . They told me to look at the ram stick in order to find if the ram is in good place.
No differences , the problem is still present after disconnection an reconnection of RAM.
did someone find a fix at this issue?
thank you.

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Macbook pro doesn't start after a long time of inactivity

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