I have strange black boxes appearing at times on my desktop.

I'm not sure why these are appearing. But this is my system and most relevant information.
Model Name:          iMac
  Model Identifier:          iMac5,1
  Processor Name:          Intel Core 2 Duo
  Processor Speed:          2.16 GHz
  Number Of Processors:          1
  Total Number Of Cores:          2
  L2 Cache:          4 MB
  Memory:          2 GB
  Bus Speed:          667 MHz
  Boot ROM Version:          IM51.0090.B09
  SMC Version (system):          1.9f4
I've found in my little bit of research that the graphics card may be dying. Here is that info from System Profiler.
Chipset Model:          ATY,RadeonX1600
  Type:          GPU
  Bus:          PCIe
  PCIe Lane Width:          x16
  VRAM (Total):          128 MB
  Vendor:          ATI (0x1002)
  Device ID:          0x71c5
  Revision ID:          0x0000
  ROM Revision:          113-xxxxxx-139
  EFI Driver Version:          01.00.139
  Displays:
iMac:
  Resolution:          1680 x 1050
  Pixel Depth:          32-Bit Color (ARGB8888)
  Main Display:          Yes
  Mirror:          Off
  Online:          Yes
  Built-In:          Yes
Display Connector:
  Status:          No Display Connected
Any help is much appreciated.
Thank you!

You may be correct about your graphics card but:
As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
You are now in a perfect position to do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
Here is a Widget to monitor your temps and other operations:
http://islayer.com/apps/istatpro/

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