On Feb 7, 2010, at 2:52 PM, Kevin Avery wrote:
Try an Open Firmware reset of the video RAM.
snip
set-defaults
reset-nvram
reset-all
Just to head off future confusion, I'll be pedantic here.
This procedure dies NOT reset the 'video RAM'. That is volatile,
its contents go away when the computer shuts down.
OK, here is the status so far;
All of the troubleshooting have done in the past on this iMac has
been in the dark, now in the daylight the "white screen" looks sort
of grey.
I was able to boot it into Open Firmware, I actually could see the
words on the iMac screen. So I issued the above statements one at a
time, hitting return after each one, no help, still a white/grey
screen
I have reset the PRAM using Option-Apple-P-R and let it bong 4
times, same result.
Hooking up an external monitor shows "input signal out of range",
that is on 2 different 15" flat panel LCD monitors, one is an NEC
and the other is a Compaq. I have no other monitors in the house to
test with.
I have been holding down the C key when trying to boot, i am pretty
sure that I dont need to at this point because I should be getting
the folder icon that comes up when it can't find a boot device.
I have also removed and reseated the RAM. And I actually have
removed the third party RAM and left in just the 128mb of Apple
branded RAM. Still the same result.
I removed the battery, it is definitely bad, it tested at 0.66 v DC,
and is supposed to be 3.6 v DC. I tried to boot it without the
battery and have gotten the same white/grey screen result.
I appreciate all of your time and advice.
What should I try next?
Thanks,
Kevin
One more update.
I left the room to do something else and had left the iMac on. I was
out for about 30 minutes and when I got back I had the blue screen
with the folder/question mark icon flashing.
So, I rebooted with the power switch and held down the C key, I did
not hear any noise from the CD drive and about 10 minutes after the
bong the screen went from grey to white. Then it went about 5 minutes
later it went to the blue screen with the flashing folder/question
mark icon. I was holding the C key down the whole time since just
after the bong.
The battery is still out. The external monitor still says signal out
of range.
Any advice is greatly appreciated.
Thanks,
Kevin
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