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 Post subject: IBook A1007 Boot Problem
PostPosted: Thu Apr 09, 2009 9:54 pm 

Joined: Thu Apr 09, 2009 9:46 pm
Posts: 1
Have a 900MHz A1007 iBook. Initial problem seemed to be a bad battery. Was able to recondition/reset it after an apparent complete drain. Now fully charged (based on battery LEDs), but the machine will not make it past the boot process.

Upon pressing the Power button, it Dongs, the white screen comes on and stays on, the CD clicks, and a Firewire attached drive eventually powers up after a couple of seconds. No apparent internal HD activity near as I can hear. Have reset PRAM, tried booting both with and without AC adapter plugged in (it shows Green). Have tried force booting off an install disk, force booting off the Firewire drive... but the screen never shows anything but white.

I would assume the logic board is bad, but the power up sequencing seems in tack (the Firewire power is delayed until something executes or times in). In addition the PRAM reset and the PMU reset actually seems to work.

Any ideas before I trash it ?

Thanks.... Joe

 Post subject: Re: IBook A1007 Boot Problem
PostPosted: Sat Feb 06, 2010 9:56 pm 

Joined: Sat Feb 06, 2010 9:36 pm
Posts: 1
Hi Joe, If you have an operating system installer disk you can boot the iBook up using the CD/DVD drive
then try to run disk first aid from the drive utility program.

However here are a few things to try.

If you have a airport card take it out.
Detach all external devices.
Visually inspect the firewire connectors to make certain the center plastic
is not damaged and pins are not shorted. Check all your connectors, for damage
or foreign objects.

Power up your iBook and try to boot it into SAFE MODE
http://support.apple.com/kb/HT1455 (what is safe mode: http://support.apple.com/kb/HT1564)
Sometimes booting into safe mode will correct drive directory problems otherwise you should
run disk first aid if you can.

It is quite possible the hard drive has failed, particularly if you cannot hear it spin up.
You can put your ear down to the keyboard to try to hear if the drive is spinning.

Next step is to remove one memory from the computer if you know how to do that.

My analysis is there is something on the microprocessor buss that is loading it down
as a result of a short circuit or simply a marginal component. By " unloading" the data bus you may be
able to eliminate the defective component. Airport cards and memory should be easy to remove.
You also may be able to disconnect your keyboard and power the mac with no keyboard.
You get the idea. The more devices you can remove the more you unload all the data and address busses on
the microprocessor.

You can also try removing the battery, unplugging the power adaptor and letting the iBook sit overnight.
Try starting up the ibook without the battery in the morning and do a MULTIPLE PRAM reset with no battery.
Reintroduce the battery, and see if you can boot.

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