IBook won't boot, stops at gray screen--HELP

Question

I couldn't find this exact topic at first glance and I am hoping someone can help me. My ibook is about 5 years old and has only really crashed on my once 2 years ago but I was able to reinstall the OS and go on my way. This time, however, nothing works. I tried to boot up yesterday and the gray screen appeared and that was it along with a strange buzzing sound. I tried Disk Warrior, wouldn't even boot off that. Also tried booting off system disk 1 and didn't get past the language screen, just hung up with that buzz again.
Does this sound like a logic board issue? Can it be rescued?
Thanks in advance for any help!

Answer 1

I'm not sure if the computer can be checked out at home in such a way
in its present state, to see if there is a logic board failure behind it, now,
or not. There could be a hard disk drive failure, or ATA controller failure;
and a short list of other possibilities, best checked over by a specialist.
Certain keyboard commands and things could be tried (and I usually
assume they'd been tried before asking here, but that's often not so)
just to see if one or more of them could get a rise out of the dead Mac.
Be sure, if you can get the installer disc to boot the Mac, that you
try and use the Disk Utility to repair disc; maybe more than once;
and do not try to just reinstall an Archive and Install. The HDD may
have corruption issues and it may need low-level zero-data and re-
formatting before a new system could go on there, if it worked at all.
{Even trying to reset PRAM/NVRAM and then seeing if you can get
the bootable OSX installer disc to start up the Mac could be OK.
Maybe that PMU reset, as a last resort? It probably won't hurt...}
A system on an external bootable enclosed hard disk drive could be
used by a tech or a prepared home-tech owner, and a clone of the
machine's system then attempted to be used to boot the ailing Mac.
If the optical drive and other components relying on the logic board
are dysfunctional due to a defect on that main board, most external
devices may also have a hard time trying to use these methods of
outside efforts to troubleshoot be nominally successful.
There may be a way a tech can use an second computer to get
data off the drive in your iBook, should it come to that, by using
the FireWire Target Disk mode and see if your iBook can start
and act like an external hard disk drive. A copy of the drive's
content or parts of it may be made by the second healthy Mac.
A clone (perhaps not bootable if data on it is damaged and not
recoverable) could be made if the second healthy computer has
a clone utility and also an external drive it can copy/clone the
iBook's drive content over to. This may be asking too much;
but the home user who has stuff on hand could do it shortly.
Anyway, there are some ideas online, if you can search google
and choose appropriate words; I looked but you may need to
read through several different source links to see if anything
sounds like it may work. re: iBook won't start past grey screen
Some users have tried resetting the PMU, others tried NVRAM
and PRAM; a few tried SafeBoot to see if the system was OK
enough to load in a reduced startup mode; maybe where the
system's own Disk Utility could be ran to at least fix permissions.
And of these, if it is truly a logic board or a failed hard disk drive,
they won't really do much. Probably no harm; and that is part
of what troubleshooting is all about, working with zeros and ones!
Good luck & happy computing!
edited to add a chapter.