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I'll start off by asking is the computer still under warranty? If so, I'd suggest just sending it back to them to be fixed, or else you'll be voiding your warranty tinkering with the hardware of your computer.
That said, I would begin by unplugging the floppy drive that you recently installed into your computer and see if it boots up like normal. Although that should have no effect, from your description that was the only thing that you changed. If that didn't fix the problem, there could be a lot of things causing your computer not to boot. For starters, it could be heat. Check in your bios and make sure your external temperature isn't over 50 degress celcius if any. On die shouldn't be over 70 max (some bios' show one and not the other and vice versa). If it isn't running hot, what I would do is basicly rebuild the machine one piece of hardware at a time. Take everything out except the motherboard, processor (obviously), video card, and ram, and just see if the video card will still post. If it does, then add the hard drive and make sure the motherboard is seeing it and find out if it will continue to boot. If it won't boot, check in your bios and make sure it's set to be in the boot sequence still. It shouldn't have anything to do with any jumpers on the hard drive because you haven't changed anything. Basicly, just continue building your computer one piece at a time back to normal until it no longer boots to narrow down what the problem is. While doing this, you'll find a better idea about what is wrong with the machine.
When you have more information about what it is and isn't doing, come back and post and see if we can help out some more. With the current information you've given, it's really really hard to say what it is and isn't.
Scott
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