Mac Mini 2011 Black screen

I have a mid 2011 mac mini (Intel HD 3000 graphics) with 8 Gb RAM running Yosemite (10.10). It's connected to a LG 42 inch monitor.
Randomly, the screen blacks out for 2-3 seconds and then returns.
I have:
Reset the PRAM
Removed one of the memory SIMMs so that only one bank is used
Looked at the system reports on Console but nothing pertinent appears to come up
None of these have helped. The problem only started occurring after an OSX software update in Snow Leopard and have persisted through Mavericks and now Yosemite.
I've seen problems here on other Mac Minis and their solutions but nothing for a 2011 Mac Mini with HD 3000 graphics.
I'd be grateful for any solutions.

I should add that I connect to the monitor through HDMI.

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