after removing logic board on my 20"imac g5 i sight to look at caps
everything was fine, replaced my board. my led diagnostic light # 1
goes on when plugged in. thats ok when pressing power button
light #2 goes on but right off.jumps right to led #4 and 4 light
stays red. ahy help appreciated. unit does not power up
PowerMac, Mac OS X (10.5.8)
There must have been a reason you removed the logic board in the first place. If so, what was that reason? How was the iMac working before you removed the logic board? If there was a problem of some type, can you describe the symptoms?
i was getting kernel panics, just wanted to check capacitors, also got notice to always
restart computer with the many languages box, folder with finder, flashing question mark
before logic board removal did everything possible to get it up and running. installed new hard drive
that went ok when it was running, did that after kernels appeared.
You can try resetting the SMU (power management). This is the procedure
http://support.apple.com/kb/HT1767
Be sure to disconnect all cables. When attempting to power it up initially, there should not be anything connected, except the power cord. If the iMac was plugged into an old or overcrowded power strip (surge suppressor) before, try connecting it directly to a wall outlet.
A dead or weak PRAM battery can sometimes cause startup issues, although I don't think it would cause kernel panics. Has it ever been changed? When you unplugged the iMac from power to remove the logic board, any remaining charge in the battery may have completely drained. The part looks like this
thanks for getting back, never changed battery, im pretty sure with this imac g5 i sight the logic board has to come out again to change this battery, correct???
iMac G5 Take Apart Instructions
YouTube's "How To" tutorials.
===============
SynapTECH is even cheaper - $1.00.
CR2032
replaced battery, when first powered up went to second led light green, looked like it was going to work
did not jump to 4th led light red as it did before, probably shoul have let it run its course but was
so happy i shut it off to replace some screws and put it all together, trid it again before closing
up went to 2nd green then right off and again jumped to 4th light red. red is overheat light
from what i understand, unit not on long enough for that to happen, still frustrated!!!!!!!!!
some of the codes i was getting prior to this
unable to find driver for this platform
darwin kernel version 9.1.0
mac os version not yet set
panic cpu 0 caller ox0036c4F8
all greek to me
The only thing I can think of is to put it back into that somewhat disassembled state when it appeared to be working better. If it actually does work better that way, try to figure out why. Were any of the internal cabling disconnect in this state of assembly? Did it actually start up all the way to the Desktop (or just get passed the lights)?
If the "4th light red" is supposed to indicate overheating, perhaps a fan is being affected in some way when it gets more fully assembled.
Oh... I'm not sure if it actually gets to this point in the startup process, but if it does, you should try resetting PRAM, if you have not done so already AFTER replacing the PRAM battery.
done everything possible, cannot reset pram, does not stay on long enough.
sometimes indicator light goes on when i press the power button, sometimes not
its leading me to think its the power supply, but you cannot keep replacing parts
without testing them. would need pinout of the power supply my # 614-0363
if i might add, in the very beginning before kernel panics, it would freeze
Except for RAM installation the iSight model PPC iMacs are not user repairable. You would be better off taking it in to an Apple Store or your local AASP.
its easy once you put your mind to it, they learned by a book anyway. back to my problem, i was able
to get it up and running by pressing the reset button on the logic board. still getting restart your computer
message with all the languages, plus i got a loud beep, now with a flashing power light and this
panic CPU 0 caller
0x0036c4f8 unable to find driver for this platform
this is where i am at present
finally got to safe boot sign in but computer was laying down could not make mouse work
up righted unit, now cannot get to safe boot again by holding shift key
getting now unresolved panic
Kernel panics are hardware problems which you already know you have. 😉 Check out the following KB Articles:
User Tip: Kernel Panics? Don't panic too!
most of the time i cannot get to safe boot, just gave up again, gray screen apple logo, spinning
gear wheel, fans come on full force, back to message restart your computer, should i give up
something tells me its a simple fix?
these kernel panics are driving me nuts, i cannot understand why someone cant read a kernel panic
and know what the problem is, all this stuff safe mode, hold this key hold that key and you still have the problem if at apple they know the problem so should the novice a code is a code its meant to be broken
one of those codes says exactly what the problem is. why such a secret???????
imac g5. i sight led light
