No, you don't have insufficient RAM, you have insufficient test code.
The supplied test code is very simple and will do a couple quick
checks... sufficient if something has failed hard. But intermittent
problems have to be beat upon by test code for minutes, hours, days or
even weeks to surface the problem.
The problem as you described it is perfectly consistent with failing
video RAM or elsewhere in the RAM addressing hardware. What's coming
back to the screen is color information for that part of the image but
it's not what's supposedly stored there. The fact that it moves about
from time to time tells me it's in some particular memory location but
where it appears depends upon what application or window of the app the
OS has currently assigned to use that failing piece.
Call Apple. Let them send you a new one.
Chuck Norcutt
Bob Whitmire wrote:
> Thanx, Chris, I'd forgotten completely about Tech Tools. I updated
> Tech Tools Deluxe to include Leopard, and it passed the video ram as
> well as all other systems with flying colors. Now, I suppose the
> deluxe version might not have checked my particular video card, but I
> can't imagine that as it's the card that came with the machine. When I
> get time I'll look at Tech Tools Pro and see if it lists the cards it
> will check.
>
> Which leads me to believe that I might just be looking at an
> insufficient RAM problem.
>
> --Bob
>
>
> On May 24, 2009, at 7:28 AM, Chris Barker wrote:
>
>> For the Mac, TechTool Pro will check hardware as well as check and
>> rectify system software problems.
>>
>> Chris
>>
>> On 24 May 2009, at 12:14, Chuck Norcutt wrote:
>>
>>> Yes, I should have said DIMMS. SIMMS are too far back for your
>>> machine.
>>> Just to be clear, I really think the problem is in the video card
>>> memory but I don't know how to test it. The fact that you're not
>>> seeing
>>> the problem at the moment may just be that that piece of memory is
>>> not
>>> in use or the access pattern hasn't triggered the fault. Some memory
>>> problems don't show up except with certain bit patterns.
>
--
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