Black/Noise-swirl display issue on Mac Mini late 2012

I have been getting Black/Noise-swirl display cut-outs lasting up to 3 seconds, occuring about twice a day.

Hardware: i7 Quad-core Mac Mini (L2012), 4GbRam, 1tb HardDrive - currently using the Apple HDMI to DVI apdapter into a LG Flatron IPS225 LED Disaply.

The problem doesn't appear to be related to any particular app that was running.

The LG display is LED IPS and is at full 1920 x 1080 resolution. Overscan is off.

Trying to determine if it is related the screen or if this is to do with the Intel Hd Graphics chip within the Mini, as both are recently purchased, so it is quite a concerning issue!

Has anyone else been getting similar problems?
Any help appreciated! thanks