Macbook Pro Retina 2014 HDMI problems

Hi,
I'm new to the Mac world, so please forgive me if I'm overlooking the obvious. I'm trying to connect my new 2014 Macbook Pro Retina to my VGA monitor via a HDMI adaptor. I've used this adaptor without problems on my Lenovo laptop running Ubuntu. However, when I connect it to the Mac, the Macbook display flashes, sometimes I see the display preferences and it correctly identifies the monitor, an old Acer wide-screen, flash up and it flicks between various resolutions and preference options; other times it just flashes and then goes blank (the only way I know to get back from the blank screen is to turn it off and on again). Other times it just flashes and then does nothing, certainly in display preferences I don't see the other monitor and the other monitor is blank.
I know the cable and monitor work, I can understand their being a resolution problem, the monitor is way less capable than the retina screen. So, is there any way to tell the Mac to use extended mode instead of mirror mode from the start?
Can I basically set-up the monitor and then plug it in, so it doesn't have to try and auto detect everything and have a heart attack?
Also, it seems like all the failed attempts have stopped the Mac even trying to figure out what to do. I have deleted the plist files, which I assume are the configuration files so it will try and figure out what to do again, but it just seems to have now succumbed to the fact it doesn't want to work with it.
Any suggestions, very much appreciated.
Thanks,
Paul

Thanks for the suggestion, unfortunately the monitor is not available to be selected under Display > Colour. When I have the display properties open, it does flash up a new window with the correct monitor and various resolution settings, but it is not possible to select one or do anything as the display keeps flashing and the cursor keeps jumping to the top left of the screen, then everything goes blank.
The HDMI to VGA adaptor that I use is a CAMAC (not the best in the world I'm sure but has worked solidly with my Lenovo laptop and Unbuntu).
The monitor I'm trying to connect to is a Acer AL1916W (again not a great monitor but has worked flawlessly with every over computer connected to it including the Lenovo with the HDMI adaptor).
The Mac is defiantly recognising the monitor, it just can't seem to decide what to do with it, flashing up display property windows and swapping between settings before giving up and everything goes blank.
Any other suggestions very much appreciated.

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