Macbook has troubles booting after....

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..it has been left unused time. has happened twice far , doesn't happen. macbook power on, chime backlight not come up. replaced since previous 1 kept shutting down after time, after replacing doesn't happen no longer, there still strange.

first time happened booted after resetting power management. time power off , on again, third boot successful, although didn't wait long during 2 attempts.

both times tried power on battery, have test further of course.
long time think machine takes strangely long time in white screen when it's powered on, has continued booting after thinking.
 



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