MBP won't power on, but only after being left off overnight.
Looking for some help on a late 2008 MBP 2.53ghz.
Has been working like a champ since new, but has recently developed an issue turning on when left powered down overnight. SMC and PRAM reset has no effect. Battery is in good condition with charge indicator showing fully charged. MagSafe indicator also works as it should. The correct charger is also being used.
The problem only appears on the very first boot after a night powered down where it will show no signs of life other than a green light on the MagSafe and a full charge indicated. Shorting the power switch pads on the motherboard has no effect, eliminating a failed power switch. Getting the laptop to power up seems to be a crapshoot of removing the battery and mains power, letting it sit for a while, then reinstalling battery and power where it will then boot. When this doesn’t work, removing the battery and mains and holding the power button down while plugging in the mains only, seems to bring it to life - with fans going full pelt. Subsequent reboots after this initial process goes without problem, as do reboots after leaving the laptop off for a few hours, it only happens on initial boot after being left powered off overnight. Interestingly -and it may just be coincidental- this seems to have manifested itself after the last Apple Firmware update.
Time for replacement logic board?
Any help would be greatly appreciated.
Update (04/26/2016)
Quick update.
I have now tested the mainboard with any unnecesary components unplugged: Trackpad, IR/Sleep Sensor, Battery Level Indicator, Airport Card, Optical Drive, Camera, Mic, Express card and Battery. The power on issue still remains. Next step is to remove the main board, give it a good clean and a proper once over.
Ever forward.....
Oh, FWIW Apple Hardware Test shows no problems. Go figure.
3 件のコメント
What happens if you put it into sleep mode over night (closing the lid or using the menu option)?
Dan さんによる
Good question. I'll leave it in sleep mode tonight and report back. Sleep mode works fine at all other times.
Keepergoin さんによる
Yes, it will wake up fine after being left in sleep mode all night. It will even fire up normally having shut it down and fired it up after leaving it in sleep mode all night. The problem with turning it on only persists after fully shutting it down overnight.
Keepergoin さんによる