Only boots up sometimes
Hi.
My Macbook air 2009 only boots sometimes. About 3 out of 10 times.
At first it had the problem that when booting it would freeze during the OSX init. (Status bar stopped loading)
I have reset NVRAM with the option, command, P and R key combo. It seemed to clear it and the device started.
Now it wont always start up and i'm thinking maybe bad RAM.
In system report -> memory it shows 2 x 1 GB RAM in each slot with status OK. But product and serial number shows no info.
Any ideas as to what this might be? Bad RAM or maybe kernel panics??
Best Anders
Update (04/27/2017)
Hi.
Thanks a lot for your fine reply!
I have gone through some of your suggestions and I do not think the RAM is bad afterall.
I have replace the battery, so this is not the problem.
I have disassembled the unit and power buttonand using my fingers directly on the button i have had several succesfull boots.
I would like to try using the power pads to confirm this. But where are these?
I have posted a picture of the motherboard here:
Best Anders
Update (05/11/2017)
picture here
Update (04/27/2017)
notice the RAM is placed different. The PCB says 94V0.419H REV A.
EMC 2334
Update (04/27/2017)
Update (05/17/2017)
picture of motherboard with power pads
Update (04/27/2017)
I found them! Holy **** i found them :) The power pads that is.
It was a risk, but i dont think it will come to life, so why not try.
They are marked with red in the picture should you ever need it.
Unfortunately still the same issue, the computer wont allways turn on.
When the pads are shorted ( or power button pressed) The fan starts to spin. And does so for about 6-7 seconds.
Then the fan slows down (as if the computer was turned off ) and comes to a complete stop.
Then again it start to spin but it never comes on. ( only sometimes)
I'm thinking maybe power/voltage issue?
Anything ideas as where to look?
Best Anders
Es esta una buena pregunta?
1 comentario
Thanks again, but the two motherboards are not the same, cant find power on pads :/
Best Anders
- de Anders Laursen