Dell Inspiron 5100 Blinking Orange Light + Boot Issues

Hi all.  I have an Inspiron 5100 I purchased sometime around August 2003.  It's recently started blinking an orange light where the green lights normally are on the front.  I believe it's the furthest light on the right.  It's green, then will blink 4 orange "flashes", go back to green for a split-second, then blink 4 orange again ... basically 4 orange, green, 4 orange, green - flashing sequence.
I'm not sure what that is and the computer is still running, but it didn't blink orange previously so I'm concerned about it.
Also, I've loaded Linux - Fedora Core 9.3 onto the notebook and that's working and stable - and has been for several months without a problem.  Now however, I need to reload Windows onto the box too, and I wanted to set them up in dual-boot, so I was going to reformat my HDD from BIOS and reload Windows on a blank drive, partitioning it for Linux and Windows.
However, after I changed the BIOS to boot from CD with the Windows XP CD that shipped with my notebook I get a blank screen and nothing happens after the "Press any key to boot from CD" message.
If I go into the BIOS to try and reformat my drive from there, I cannot select the HDD and have no option to do a low-level BIOS format.  Under the passwords section in BIOS it shows HDD password frozen - or something to that effect.  I'm at work now and the notebook is home.
Basically, I have a blinking orange light and I cannot reload windows because I can't get the CD to actually boot into Windows Setup.
Please advise.
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