Monitor Issues after upgrading Mac Mini OS to Mavericks

I upgraded my older Mac Mini OS to Mavericks. The monitor always worked fine on Snow Leopard (10.6.8 I think), but now my Hanns G monitor takes fifteen minutes to display anything. Until then it is blank and makes clicking, popping noises every 3-5 seconds. After it comes up, it works fine and all the settings seem to be correct. Any ideas? Many thanks for any help you can provide.

Some more info: the monitor is a Hanns G HC194D and is set for 1280 x 1024 with a NVIDIA GeForce 9400 256 MB graphics. My Mac Mini has a 2.26 GHz Intel Core Duo processor and has 2 GB 1067 Mhz DDR4 memory. The monitor display profile says it was created two weeks ago which strikes me as a bit odd, but I updated the OS well before then and this has been an issue since I updated to OS 10.9.3. I have played around with the cables and the connections are tight, and once the monitor finally displays after 15 minutes or so on start-up or deep sleep, the monitor looks and runs fine.
It seems too coincidental that this problem only surfaced after upgrading the OS for it to be a monitor hardware issue, but I haven't seen any other reports of this type of problem. This is a very frustrating problem, so thanks for reading this far.

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