Try resetting the Parameter RAM (PRAM) - pronounced peeram. Restart the mac and depress the alt, command, P and R keys simultaneously. You should hear the boot chime. Keep the keys depressed until you hear the boot chime a further three times. On the final boot chime release the keys and let the mac boot normally.
With due respect the instructions you provided for resetting the PRAM are incorrect. The correct instructions are found in the following Apple Advice letter:
Resetting your Mac's PRAM and NVRAM
Thanks, I will test your tip this evening.
At the last test this morning, after a PRAM reset (3 times), when I don't touch anything, the bug screen does not appear. But, when I launch a spotlight or anything else (like a Finder), I've a bug screen (a purple/pink screen this time).
And if I try a 10.5.2 install (delivered with the iMac), I've directly a grey screen after boot.
Do you think that I must install Snow Leopard update from 10.6 to 10.6.4 nevertheless ?
(the bug was present too with my last 10.6.4 install)
note : my graphic card is a nVidia 8800 GS
I don't how these instructions are the same, here is what the article says:
_Resetting PRAM and NVRAM_
• Shut down the computer.
• Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
• Turn on the computer.
• Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
• Hold the keys down until the computer restarts and you hear the startup sound for the second time.
• Release the keys.
Your original post said *"Restart the mac and depress the alt, command, P and R keys simultaneously. You should hear the boot chime. Keep the keys depressed until you hear the boot chime a further three times. On the final boot chime release the keys and let the mac boot normally."* How I understand your post that totals 4 chimes vs. the 2 Apple specifies. Am I missing something?
Message was edited by: rkaufmann87
Not sure if this helps, but do a search in these forums or maybe a Google, I seem to remember there was a problem like it a while ago and lots of discussion about it. hopes this helps.
Alternatively you might run Apple Jack (http://applejack.sourceforge.net/) there might be some funny stuff stored on your Mac over time and now that it hears it has to leave you it thought I dig out some trouble and see if I can stay. no seriously AppleJack sometimes solves funny things like it.
I understand. I don't take the support article too literally. In my experience sometimes two PRAM Resets is not enough. I have done 5 or even 6 in the past after doing one or two and they have fixed the problem at that time. As long as it's two or more then you have a fighting chance of it possibly fixing the issue.
@Tony : So, I will test a 10 times reset PRAM this evening and post just after to tell you if is ok
@ChangeAgent : Ok, I will test your solution just after the PRAM reset, and maybe Onyx ?
I will test too :
- A SMC reset ?
- Detect monitor in "System Preferences > Monitors"
- Mirror video (check or uncheck) in "System Preferences > Monitors"
- "System Preferences > Startup Disk" and choose internal HD
- Apple Hardware Test
& return to this post if all of that doesn't work or work
This always gets confused. It's a total of 3 chimes. The startup chime + 2 more. (But I don't think 4 chimes total does any harm.)
Antonio Rocco wrote: In my experience sometimes two PRAM Resets is not enough. I have done 5 or even 6 in the past after doing one or two and they have fixed the problem at that time. As long as it's two or more then you have a fighting chance of it possibly fixing the issue.
Tony, are you saying several PRAM resets may fix a problem where only one doesn't? Never heard this before. This is very interesting, if true. You mean reboot 2 or more times with PRAM resets each time?
Message was edited by: WZZZ