Currently Being ModeratedJan 15, 2013 8:22 AM (in response to adison132)
Do you have an external firewire CD reader you can hook up? I'd sure like to run the Apple Hardware Test. How about a bootable backup? If you have one, can you boot holding the alt/option key down when the bootable backup is attached via firewire?
Currently Being ModeratedJan 15, 2013 8:40 AM (in response to adison132)
I realize you cannot boot from any Mac OS X disc, but please try booting from your Apple Hardware Test CD / DVD, or whatever disc that shipped with your PowerBook that has the words "Apple Hardware Test" or "AHT version xxx" printed on it.
To do this, start your PowerBook and insert the disc as soon as the drive's mechanism accepts it, then hold an Option key to invoke Startup Manager:
Using the cursor (arrow) keys, select the optical disc and press Return to boot from it.
Does this work at all?
If not, the next suggestion is to boot in Verbose Mode: hold ⌘ v while starting your Mac. The point beyond which it cannot progress will be shown as text. Transcribe it or attach a readable photo in a reply.
Try removing and replacing your RAM if that is an option for you.
This looks like a hardware problem for which a repair may not be economically justifiable. The contents of your hard disk may be retrievable using FireWire Target Disk Mode or by its physical removal and installation in an external drive enclosure.
To eject the optical disc restart your PowerBook while keeping the trackpad button depressed.MacBooks iMacs iPads AirPorts, OS X Mountain Lion, 28 years Apple!
Currently Being ModeratedJan 15, 2013 8:43 AM (in response to BGreg)
I'm pretty sure that my CD drive is ok.Also I forgot to tell that when i'm trying to boot
Hardware test i got an "invalid memory access". I'm starting to think that my powerbook
has got broken bootloader or something.
Currently Being ModeratedJan 15, 2013 9:34 AM (in response to adison132)
Everything looks OK right up to the moment the GPU fails.
AHT requires a minimum amount of operable hardware to run. You indicated earlier that AHT said "invalid memory access" or words to that effect. No further diagnosis will be possible.
Currently Being ModeratedJan 15, 2013 10:01 AM (in response to adison132)
A corrupted display tells you everything you need to know. It only confirms what you already observed in your original post.
If you are so inclined you could shop for a replacement logic board from a reputable parts dealer. PowerBook Medic and iFixit come to mind. The supply is limited but prices are quite reasonable, and it will be guranteed. Be sure to specify the exact model required. Disassembly, removal, and replacement are tedious chores for the technically adept only.
You could try eBay, as long as the board is guaranteed.
Buyers on eBay essentially have the last word on returns these days. Sellers have no choice but to accept returns, as long as it is within the allotted time.
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