Imac G5 - screen freezes with patterned screen

Yesterday my Imac G5 suddenly had the whole screen covered with patterns which in turn froze
the machine up.
Tried using the hardware test (both quick & extended) found nothing wrong.
Tried resetting the Pram & Nvram - made no difference
Tried resetting the SMU - made no difference
Ran Disk Utility to repair permissions - all OK
Used DiskWarrior and no problems found.
Powered off and left it all night and restarted this morning all systems appeared OK
This evening this problem returned and had to power off again which is where I am now.
I have looked thru these forums and found reference to faulty capacitors about bulging, leaking etc
and removed the back but could not see any faults
Any one have any clues as to what the problem is?
I would appreciate some help here please
Alan

Nobody knows when Apple releases new models, but I think that they usually come out in the spring.
Or sometimes in the fall. In other words, there is no set time.
Try calling http://www.synaptech.com/catalog/ as I suggested, they replace logic boards very reasonably.

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Hello,
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The wierd thing is that sometimes it doesn't do this for 2/3 days and sometimes it does it like 3/4 in an hour (have to restart manually). Also, this is very interesting, I have a version of Windows 7 installed on my iMac wich I use mainly for gaming and under windows it NEVER freezes in any kind, even when I game like 5/6 hours long straight.
Therefor I thought it must be a software problem so I did a complete system reboot 2 days ago but that didn't help, already froze 3 times since...
Can anyone help me? I still have 2 months of applecare but I have a LAN party soon so I am not to anxious to go 3 weeks without my iMac, maybe there is a simple solution that I am missing...

Some things you can try:
1. Try a new user account, create one in System Preferences -> Users and Groups, test to see if the issue still persists in this new user account, this will give us a lot of information. (if the problem is the same or it vanishes, let us know)
2. Make sure all your software is up-to-date, Apple Logo -> Software update.
3. Unplug all 3rd party devices, just keep in the necessary, Power, Keyboard + Mouse, no ethernet or external hard drives etc.
4. Reset the PRAM http://support.apple.com/kb/PH4405
5. Reset the SMC http://support.apple.com/kb/HT3964
6. Boot to the recovery partition (CMD + R on startup until you see a spinning cog with an apple logo, then let go) -> Choose english as the main language -> Choose Disk Utility -> Select your hard drive from the left pane of Disk Utility (NOT Macintosh HD, the one that will look similar to: 1TB ST3200WAJS) -> Select the 'First Aid' tab -> Bottom right of the window it will say 'S.M.A.R.T Status: ________' ... What does it say after smart status?
7. While still inside the Recovery Partition, select Macintosh HD -> First Aid (tab) -> Verify Disk -> Repair Disk (unless it says the volume Macintosh HD appears to be OK) -> Verify Disk Permissions -> Repair Disk Permissions (if there are differing permissions on the disk)
Let us know if the issue still persists, but make sure you do all of those steps correctly and post back as much information as possible (PRAM takes two chimes at startup, unplug the power cable for 15 seconds, plug it back in, wait 5 seconds, turn on... make sure you follow all articles)
Good Luck!
MiiCK

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The next time you have the problem, note the exact time: hour, minute, second.
If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
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☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
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Scroll back in the log to the time you noted above. Select any messages timestamped from then until the end of the episode. Copy them to the Clipboard (command-C). Paste into a reply to this message (command-V).
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
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Important: Some private information, such as your name, may appear in the log. Anonymize before posting.

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I would go for the 5K iMac. You can add a second screen at 4K.
FaceTime HD camera
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The Mac Mini supports:
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Thunderbolt digital video output
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The 2013 Mac Pro can use three and more displays:
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Just wondering what Apple's stand is on the issue with a flickering and a dark area appearing on imac 27"screen - forums seem to indicate this is not uncommon - and happens through normal use - so should be subject to repair (Sale of Goods Act - 6 years)

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IakovM,
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Message was edited by: S.U.

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<http://homepage.mac.com/strait/Sites/Macbook/pages/MacBook%20Freeze%20Screen.h tm>
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Well ive had this once or twice and the only time it has ever happened has been first time just after logging in and the other couple of times when waking up from being asleep.
Exactly the same screen as the first poster.
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a. ive just got it setup the way i want, and
b. it works fine 99.999999% of the time
Oh and ive rebuilt the whole system from scratch, but that was for a different problem with .Mac not syncing correctly.
Ste

Imac G5 - screen freezes with patterned screen

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