Connecting 19" HP L1908wm monitor to 17" 2006 iMac

Hopeless tech idiot here. Thanks in advance.
My late 2006 iMac has the common lines down the screen, so I bought a 19" HP L1908wm monitor on eBay for about a hundred bucks. I also bought a mini DVI to DVI adaptor, so I thought I was set.
The monitor comes, I plug it in, turn it on, and it's worse than the iMac -- red horizontal lines instead of multi-colored vertical lines. When I press the menu button on the monitor, it says at the bottom of the menu display that the resolution is 1442x900 instead of 1440x900 and 59 hz instead of 60 hz. I assume this is my problem and that I could fix it if I could run the setup software, but of course that's formatted for PC.
Have I gone and bought a monitor that won't work? Can I fix the resolution without using the install software? Can I access the setup software some other way? Finally, if it's all for nought, can anyone recommend a 1440x900 external monitor that WILL mirror my iMac?
Thanks again.
best

Unfortunately I tried this and couldn't get DisplayConfigX to correct the HP monitor's malfunction.
Relevent? I do not have internet at home, so I downloaded the program to a flash drive, copied it to my hard drive, and then ran it.
edit: spelling

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