I'm glad to see a fellow ebayer here
i tried selling my custom built computers a couple times and never got anywhere near what I wanted for them. unfortunetly computers dramtically lose their value very fast, especially one that's 3 years old.
most people only look at CPU clock speed to determine the performance of the machine, and like AMDIsTheBest said, 1.9GHz is really slow for a P4 these days. so when they can buy [what they think to be] a faster, brand new computer from dell/hp/emachines for the same price, why would they buy used?
from my experience on ebay, only brand new (zero-feedback) members place bids early and they are almost always very low bids. they usually never win the auction either. most bids come in during the last couple hours anyways (which is why i always list items using the 1day or 3day auctions only, and only on weekends).
hopefully you get some bids on it tommorow. but if it don't then I would suggest you try to sell the software bundle separetely because most people that are looking to buy a cheap used computer will have no use for it (that's my theory anyways).
it it were me, i would ask no more than $99 to start and just hope for the best. the bidders will decide how much it's worth in the end. i know it's frustrating to sell a machine for so much less than you payed, but it will never gain value, it will only lose it. also, you have a starting price of $300, yet your listing states "And starting at 1.00!!!!"
good luck with your auction