Weird stripes appeared next to the pointer and cursor

Strange behaviour under Snow Leopard (latest) and Lion (latest) as well.

Each cursor (arrow, pointer, text) has some weird dots and stripes.

I have two monitors, and the position of these stripes are different on each monitors.

Here are the specifications of my Mac:

Hardware Overview:

Model Name: Mac Pro

Model Identifier: MacPro3,1

Processor Name: Quad-Core Intel Xeon

Processor Speed: 2.8 GHz

Number Of Processors: 2

Total Number Of Cores: 8

L2 Cache (per processor): 12 MB

Memory: 8 GB

Bus Speed: 1.6 GHz

Boot ROM Version: MP31.006C.B05

SMC Version (system): 1.25f4

Serial Number (system): 3T******1LY

Hardware UUID:

Does it mean, that something hardware problem exists?

How can be this problem solved?

Thank you.

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