The two most common causes of the Black screen error in XP are problems with the hard drive or problems with the video drivers. Since your hard drive passed the Dell diagnostic, we can presume that it's OK physically. The next thing to consider is the Master Boot Record, Boot Sector, and the integrity of the file system itself. We can presume that these are good since you can boot into Safe Mode. That leaves the video drivers as the next most likely culprit.
You can uninstall the driver from there, but I'd recommend uninstalling it from Control Panel...Add/Remove programs instead. That'll remove more traces of it than just the driver (it's a long story, but there's more to a corruption than just the driver itself - especially with older nVidia drivers).
Once it's uninstalled you should be able to boot into normal mode - but the sizing of your screen will be like you're still in Safe Mode (because it'll be using the same drivers that it uses for Safe Mode).
Most times you can't install drivers in Safe Mode, but you can give it a try. Here's the most up to date nVidia driver for your system. Just download this file to your Desktop: http://www.nvidia.com/object/winxp_175.19_whql.html
Once you've uninstalled the nVidia drivers from Control Panel...Add/Remove Programs (and have rebooted) - then double click on the file to install the new drivers.
It's important to uninstall first - as that'll remove the corruption. The installation of the new drivers won't necessarily overwrite the corruption - so the uninstall is needed. With the older nVidia drivers, sometimes a special driver removal tool was needed to get rid of all the traces - but the more recent drivers have improved enough that that tool is rarely needed these days.
Let us know how it works out for you.
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