IMac :: Pixelated Screen Display At Startup

Oct 30, 2010

I own an early 2008 iMac running Snow Leopard. A few months ago, it started getting a little buggy and running slow, you know, things you would expect from a computer that's now 2 years old. But then it started freezing and giving me "kernel panics". Of course, the first thing I did was install VirusBarrier and remove any and all viruses it could find, and I repaired the disk and disk permissions and ran all the diagnostic tests from the install DVD. Then I left it unplugged for a day, upgraded the memory from 2 GB to 4 GB and did everything a second time. After all that, everything seemed to work just fine.

Now it seems to be starting all over again! This time the virus scan only picked up a few Windows viruses on an old external hard drive and repairing the disk, disk permissions, and running diagnostics turned up nothing. I've done everything I know to do, short of taking the thing back to Apple! Right now, the main issue is this bug at startup that's really just freaking me out. Linked is a video of what happens. The apps that run at startup are BumpTop, HughesNet Status Meter (as of last month), and Brother Printer Utility. [URL]

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I have an iMac G4 running 10.4.11. (not intel). When I turned it on today, it was all pixilated, little white squares in between the colored ones. I can hardly make out what is on the screen so I can?t really choose anything using the mouse. Everything else seems normal except for the the screen.

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Info:
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I started up again and attached another screen, the image was normal on both screens. But alone the iMac still starts up with the pixelated screen.

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Oct 14, 2010

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Could the graphics card be going bad? Any ideas on what might be happening and how I might be able to solve this.

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Info:
Map Pro

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Sep 28, 2010

I have a Mac Pro (Early 2008) running on 10.5.8 OSX with apple 20" display and 16G RAM.

Initially started with my MACPRO not waking up from sleep and has to force the shut down with power button. Finally realised it was due to my Epson scanner connected via USB...

The main issues now is with the display, black screen on startup. I can still control the volume and disk eject/close, just no display. Force shut down with power button numerous time but futile. Finally solved it with SMC reset.

it becomes an on and off issues... and continuously I solved it with SMC reset.... sometimes needed 2 or 3 resets to get it to work,and finally for the past few days... SMC reset can't solve it either... no display on startup, and same thing I can control the volume and disk eject/close. Have tried my monitor on other mac and it worked fine.

Now this is strange. if I let the mac cool off totally,after a SMC reset. the display will comes up fine...

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Apr 18, 2009

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Jul 8, 2008

I have a G4 Powerbook 1.67 that I don't take anywhere. It just sits on an iCurve as a home computer. Never been dropped, damaged, looks as good as new.

That said, the screen sometimes gives me these red moving pixels which distorts the screen image a bit (pic attached). And lately the screen has been going out at times with lines across the screen, then intermittent blackouts.

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Jun 18, 2010

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May 17, 2009

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May 3, 2012

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Info:
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Jun 19, 2012

I was using my computer and it was just fine. I closed it carefully (as always) and left for a few minutes. When I came back and opened it up, the screen was completely pixelated. I turned it on and off and read several forums and tried cleaning the drives and nothing is working at all. As I've been working on it parts of the pixelation of bright colors have begun flashing a little bit. Not a lot but a little. Black doesn't seem affected by the pixelation but you can see lines in the white areas. Also when images are fading in and out, they don't become pixelated until they are at their brightest. When they are fading in and out they appear fine.The graphics card in my computer is a Nividia GeForce GT 330M. SO I'm guessing from this that the graphics card is damaged or whatever. I can't afford to have apple repair it for $400 and the nearest apple store to me is two hours away.

Info:
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Dec 26, 2010

I own a Mac Pro (2x2.8ghz Quad Core Xeon, 6gb DDR2 Ram, Nvidia 8800GT, running in 64-bit mode), and a 30" cinema display. I am running OS 10.6.5 at the moment as well.

What happens (and its been happening all day, rarely happened in the past), is that my entire screen freezes up for no real reason, and becomes completely pixelated and nothing but my cursor moves.

The pixelation even makes it through the force shut down and into the grey apple startup screen, the logo is pixelated there as well.

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Right now, the problem isn't happening, but at this rate I expect it to start pixelating very, very soon.

Does anyone have any tips?

I have AppleCare, but I need to fix this asap. I'm a photographer and a very big project depends on it (needs to be submitted by tomorrow morning).

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Mar 4, 2008

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Sep 17, 2008

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Everything worked fine until a few days ago, and i'm wondering what's suddenly causing this problem.

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Any ideas on how to fix this? Is it likely to be a problem with the hardware in the actual computer, or just the screen? Or is it a software thing?

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Jun 12, 2010

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My MBP spec:
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