Dual display help for a recently converted mac user

I have a 24" Intel IMac and I wanted to set up dual displays. I may have jumped the gun a little because I didn't do much homework but I found a big cheap monitor at Best Buy which is an HP w2338. I bought that and the mini-DVI to VGA adapter. I hooked everything up and both monitors work but I have a couple small issues that I can't seem to find how to fix. First, I have about a 1.5 inch strip along the left side of my hp monitor that isn't used at all. It is just a black strip that taunts me. When I drag things from my IMac to my HP it drags fine, but it just acts like the monitor is smaller than it is. The resolution on my IMac is set to 1680x1050 and on my HP it is 1920x1080. Second, I have very faint vertical stripes in my new HP monitor. They can be seen the best in the grey parts of my windows. Any help with either issue would be greatly appreciated.

On your 24-inch iMac's screen, the native resolution is 1920x1200. You can use a lower resolution, but the display will seem a bit fuzzy (the pixels are being approximated). So you should use 1920x1200 on the iMac's screen, unless you have a good reason to use something else.
On the HP display, it sounds like the native resolution is 1920x1080. That's the resolution of an HDTV, so it should work. However, when you connect an HDTV, it connects with a digital connection, HDMI. So I think it will work if you connect it HDMI. If that monitor happens to have DVI, use DVI.
If it only has VGA and HDMI, there was a recent topic that was very similar (same display I think). Is your iMac the older model (not the brand new 2009 model) with a Mini-DVI port? If so, take a read there to see if the information is applicable to your situation.
http://discussions.apple.com/message.jspa?messageID=9247482
Now, if that display you have is different, and it has a DVI connector, please post back.

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