1 Reply Latest reply: May 8, 2013 9:34 AM by MichelPM
MatthewBlake Level 1 (0 points)

Hi guys.


In May 2010, I bought a 27 inch i7 Quad Core iMac. I use it 100 percent for Music Production, and last week (just before it's 3rd birthday) it begun freezing consistently. The freezes were terminal, force quit was not recognised, and holding the power button to switch it off was the only option. At times, it would start up, and not freeze for 4-5 mins, but there seemed to be a period of time before it froze. I verified the disk in ulities, and repaired utilies. Everything was ok according to the Mac, including the S.M.A.R.T status of the drive.


Last week, it got worse however. I started it up, and just after the ''light blue'' boot screen before your wallpaper is display, the screen pixelated completely.

I've had it in Stream Solutions (Apple certifiied repairer) for the last 7 days. First, they got me a free 1TB replacement as I was still within the 3 year guarantee of the program. They fitted it, but the Mac still pixelates and refuses to boot. They've told me they think its the video card, and it needs further assessment.


My question is, what video card am I looking at replacing cost wise? I think those Macs had the ATI Radeons in them?


What should I be expecting to pay for a new one? Can the iMac get a better card put in if I pay more?


Really appreciate the help guys.



iMac, Mac OS X (10.6.8)
  • MichelPM Level 6 (10,645 points)

    The GPU in the 27 inch screen model iMacs isn't a video card, but a socketed chip.

    If the GPU has failed and If you know what VRAM GPU was in your iMac, you can ask if the faster, optional GPU that was available for that model year can be had and that you'll pay the extra costs to upgrade it.

    The base GPU for the 2010, 27 inch screen iMac models was a 512 MB VRAM GPU.

    The optional upgraded GPU for that model year was an ATI Radeon HD 5750 with 1 GB of dedicated GDDR5 memory.

    IF your original GPU failed and if the GPU was the base 512 MB VRAM GPU, and if Apple still has these ATI HD5750 1 GB GPUs still available, you can ask the repair center to order the better GPU and tell them you'll pay for this GPU upgrade replacement.

    Good Luck!