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Video issue (?) iMac 24"

 
 
Alan Browne
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      07-25-2012, 11:31 PM

Twice in the last couple days, the upper inch or so (24" iMac) of the
display has gone to random garbage. I can 'click elsewhere' to get
around it and restore normal display.

I don't recall ever seeing such. It may be related to an App and I'll
try to diagnose more carefully next time.

Anyone?

--
"Civilization is the limitless multiplication of unnecessary necessities."
-Samuel Clemens.
 
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dorayme
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      07-26-2012, 01:05 AM
In article <(E-Mail Removed)>,
Alan Browne <(E-Mail Removed)> wrote:

> Twice in the last couple days, the upper inch or so (24" iMac) of the
> display has gone to random garbage. I can 'click elsewhere' to get
> around it and restore normal display.


Most times my MB is woken from sleep (by key press), the attached 26"
ASUS screen displays snowflakes (similar to what you often see on a TV
that has no aerial connection) and if you wait, it comes good or, if
in a hurry, you just rotate the source button on the monitor itself to
switch to HDMI, Component, VGA and back to DVI, this always restoring
the proper desktop in all its glory. But if it happened, as yours
seems to happen, in the middle of a working session, it would be very
annoying.

Change your Energy prefs so nothing goes to sleep for a while to see
if it happens again, to eliminate any causal connection with sleep
functions. It might be a long shot except my experience is something
to do with waking, the monitor takes a while to realise it needs to
get up out of bed, it responds to the wake up call like a reluctant
sleeper,not quite being oblivious, but jumping to attention. Maybe
yours is a variation, the sleeper gets most of his body out of bed but
the head stays on the pillow...

Please return my $US0.2 if this is totally unhelpful. Your random
garbage is probably not similar to my snowflakes, mine sort of a
screen lost for a signal for a while, yours might be a hardware
problem with your board or some controller in the screen itself.

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dorayme
 
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Alan Browne
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      07-26-2012, 01:33 AM
On 2012-07-25 21:05 , dorayme wrote:
> In article <(E-Mail Removed)>,
> Alan Browne <(E-Mail Removed)> wrote:
>
>> Twice in the last couple days, the upper inch or so (24" iMac) of the
>> display has gone to random garbage. I can 'click elsewhere' to get
>> around it and restore normal display.

>
> Most times my MB is woken from sleep (by key press), the attached 26"
> ASUS screen displays snowflakes (similar to what you often see on a TV
> that has no aerial connection) and if you wait, it comes good or, if
> in a hurry, you just rotate the source button on the monitor itself to
> switch to HDMI, Component, VGA and back to DVI, this always restoring
> the proper desktop in all its glory. But if it happened, as yours
> seems to happen, in the middle of a working session, it would be very
> annoying.
>
> Change your Energy prefs so nothing goes to sleep for a while to see
> if it happens again, to eliminate any causal connection with sleep
> functions. It might be a long shot except my experience is something
> to do with waking, the monitor takes a while to realise it needs to
> get up out of bed, it responds to the wake up call like a reluctant
> sleeper,not quite being oblivious, but jumping to attention. Maybe
> yours is a variation, the sleeper gets most of his body out of bed but
> the head stays on the pillow...
>
> Please return my $US0.2 if this is totally unhelpful. Your random
> garbage is probably not similar to my snowflakes, mine sort of a
> screen lost for a signal for a while, yours might be a hardware
> problem with your board or some controller in the screen itself.


It's not. This is in current use (long after exiting sleep), probably
when pointing at a different app. I just haven't stopped to think what
"was there" before the switch. I'm annoyed at the symptom and not
slowing down to look for evidence and cause.

--
"Civilization is the limitless multiplication of unnecessary necessities."
-Samuel Clemens.
 
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Alan Browne
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      07-26-2012, 02:42 PM
On 2012-07-25 22:16 , Jolly Roger wrote:
> In article <(E-Mail Removed)>,
> Alan Browne <(E-Mail Removed)> wrote:
>
>> Twice in the last couple days, the upper inch or so (24" iMac) of the
>> display has gone to random garbage. I can 'click elsewhere' to get
>> around it and restore normal display.
>>
>> I don't recall ever seeing such. It may be related to an App and I'll
>> try to diagnose more carefully next time.
>>
>> Anyone?

>
> Could be a potential video driver issue.


I'll at least try to find some symptoms that I'm sure of. Perhaps just
re-sizing the display resolution and back will be enough to reset the
parameters of the driver.

My other fear is that it could be a caps issue. OTOH it occurs in the
same area of the screen and is cleared up by pointing another window
that the one currently at front so probably not.


--
"Civilization is the limitless multiplication of unnecessary necessities."
-Samuel Clemens.
 
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Alan Browne
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      07-26-2012, 04:04 PM
On 2012-07-25 19:31 , Alan Browne wrote:
>
> Twice in the last couple days, the upper inch or so (24" iMac) of the
> display has gone to random garbage. I can 'click elsewhere' to get
> around it and restore normal display.
>
> I don't recall ever seeing such. It may be related to an App and I'll
> try to diagnose more carefully next time.


Just happened again as I started editing a reply to newsgroup in
Thunderbird.

I tried to grab a screen shot of it, but as soon as I turned on the
selector and started to copy, it reverted to normal.

At least seems to make it a system/software and not a hardware issue.



--
"Civilization is the limitless multiplication of unnecessary necessities."
-Samuel Clemens.
 
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gtr
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      07-26-2012, 04:28 PM
On 2012-07-26 16:04:58 +0000, Alan Browne said:

> On 2012-07-25 19:31 , Alan Browne wrote:
>>
>> Twice in the last couple days, the upper inch or so (24" iMac) of the
>> display has gone to random garbage. I can 'click elsewhere' to get
>> around it and restore normal display.
>>
>> I don't recall ever seeing such. It may be related to an App and I'll
>> try to diagnose more carefully next time.

>
> Just happened again as I started editing a reply to newsgroup in Thunderbird.
>
> I tried to grab a screen shot of it, but as soon as I turned on the
> selector and started to copy, it reverted to normal.
>
> At least seems to make it a system/software and not a hardware issue.


Seems there is a hot key available for "take a picture of the screen".
That might work for getting a picture. I have an antique iMac (Late
2006), and have only ever notiched this when I am in safari and go to
bookmarks it always does a garble of the top 2 inches or so, but
immediately refreshes. It lasts less than 1/4 second before it
vanishes; barely enough to see.

 
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Alan Browne
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      07-26-2012, 07:52 PM
On 2012-07-26 12:28 , gtr wrote:
> On 2012-07-26 16:04:58 +0000, Alan Browne said:
>
>> On 2012-07-25 19:31 , Alan Browne wrote:
>>>
>>> Twice in the last couple days, the upper inch or so (24" iMac) of the
>>> display has gone to random garbage. I can 'click elsewhere' to get
>>> around it and restore normal display.
>>>
>>> I don't recall ever seeing such. It may be related to an App and I'll
>>> try to diagnose more carefully next time.

>>
>> Just happened again as I started editing a reply to newsgroup in
>> Thunderbird.
>>
>> I tried to grab a screen shot of it, but as soon as I turned on the
>> selector and started to copy, it reverted to normal.
>>
>> At least seems to make it a system/software and not a hardware issue.

>
> Seems there is a hot key available for "take a picture of the screen".


Probably. I'll look it up or set one up.

> That might work for getting a picture. I have an antique iMac (Late
> 2006), and have only ever notiched this when I am in safari and go to
> bookmarks it always does a garble of the top 2 inches or so, but
> immediately refreshes. It lasts less than 1/4 second before it
> vanishes; barely enough to see.


This sticks until I do something.



--
"Civilization is the limitless multiplication of unnecessary necessities."
-Samuel Clemens.
 
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