Photoshop problem with display driver ('GPU enhancements'?)

Exactly what versions of OS X and Photoshop are you using?

Since you referred to your old windows pc, by any chance are you running Windows on your new Mac (since it's possible to run Windows on Intel Macs, we have to ask). If you are running Windows, what version ... and are you using Parallels, VMWare Fusion, or BootCamp for the Windows support?

Here is Adobe's help page about GPU & OpenGL problems & troubleshooting. It may help you diagnose & correct the issue you are having.

GPU, OpenGL support - Photoshop CS4, CS5

"GPU" stands for graphic processing unit. It's the video processor in a computer. In the iMac, the GPU is built in and cannot be changed. In contrast, in may Windows computers you can buy your own video card (that has its own GPU) and install it yourself; or change it if you want to. Photoshop's error mesages are often general in nature and don't differentiate between computers with built-in GPUs and ones that do not.

Regarding the prompt to download Flip4Mac, you were probably trying to view an AVI or WMV file. They are Windows media file types. In order to view them on a Mac, you need the Flip4Mac component for QuickTime; it's free and works fine. You can generally view most types of video on a Mac; but the Windows AVI and WMV media types require the Flip4Mac components.

As far as your issue/question about Flip4Mac, this is Mac application that allows Windows Media audio/video to play on a Mac running OS X. Windows Media files are proprietary and without the Flip4Mac they simply won't play on your Mac.

FYI, Apple does design much of its own hardware and OS software, but does use other sources to design, build or supply other needed hardware.

Examples, LCD screens made to Apple specifications by Sharp, LG or Samsung.

Monitor protective glass made by Corning.

CPUs designed to Apple's specs., but made by Intel.

Graphics Processors made ATI/AMD.

Hard drives designed and made by Seagate or Western Digital.

RAM designed to Apple specifications but made by any number of electronics manufacturers.

Apple designs and manufactures it own case designs, probably designs its own logic boards and has them manufactured by a third party, also.

Now to your Photoshop issue, it maybe that the software drivers and or video card CPU firmware that maybe needs to be updated to work with OS X 10.7 and the version of Photoshop you are using.

To find out your video card model, you need to go up to the main menu bar click the Apple symbol and click on about this Mac. A pop up appears. In the popup window select the more info button.

A two column window appears. In the left column, there should be a section for graphics. On the right, it should give specs of your video card.

You'll find the your GPU is a ATI/AMD made graphics card with certain size of VRAM or VideoRAM.

You need to go to the AMD website and look for updated drivers or software for that model card.

There should be a section just for Mac compatible video cards, this is where you need to look for any type of updates.

Do not download any video card updates quite yet!!!

Before you do this though,mI would go the the Adobe site and go to the discussion forums there to serif anyone else is having issues the same as you are having and see if there is a fix or post a question in the help forums there.

Adobe has an online tech support help/technical chat service or help service by phone.

Explain what is happening and if they advise going to the video card manufacturers site to download an update.

Before downloading and installing any updates, report back here to confirm whether the issue was fix or not and if you did find an update to download so we can help you and confirm whether this is the correct download for your iMac and video card.