Samsung Syncmaster 2032bw Flicker

I bought a samsung syncmaster 2032bw a couple of weeks ago from ebuyer to run as a second monitor with my samsung r70 laptop (vista). It is connected by vga and runs at 1680x1050 (32bit). The problem is that the screen has an intermittent flickering, which is most apparent on dark backgrounds. I used to previously be able to run the monitor at an optimized 75hz refresh rate, which did make a slight difference (although the flicker was still obvious now and then), but since an nvidia driver update a few days ago i am only left with the option of 60hz in the advanced display settings or the nvidia control panel. I have been noticing increased eye strain and headaches from this. The current driver version is: 7. 15. 11. 8084

Since the update, my display settings are always reset when ever i restart my machine, which is becoming tedious. My graphics card is an nvidia geforce 8400m gs with an approximate total memory of 1395mb. Dxdiag notes (for both displays) that:

The file nvd3dum.dll, nvwgf2um.dll is not digitally signed, which means that it has not been tested by microsoft's windows hardware quality labs (whql). You may be able to get a whql logo'd driver from the hardware manufacturer. - How can i force a 75hz refresh rate?
- Could the flickering be down to a faulty vga cable or power cable?
- Could the monitor itself be faulty and require returning?
- Should i roll back the driver to see if this can help with the refresh rate issue?

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