That sounds very aggravating. I recently purchased a Compaq Presario:
2.8 GHz Compaq Presario SR1170NX (no monitor or speakers), which was advertised as a video editing machine for $850.00 at J&R music world online.
It has 512MB 3200 DDR ram, Nvidia 128MB FX5200 video card, USB & Firewire ports, onboard sound, DVD +R/RW, CDRW, 200 GB HD, and of course the 2.8 GHZ P4 processor. The mother board is an ASUS and the OS is XP home.
I have built many a PC, but for the price I decided to try it. The only problems I had were when I let Norton AV stay enabled while flying AH2. The tech people at Compaq told me to remove all startup programs (which is pretty easy to do btw), and that works, but NAV was my real problem with AH2. It's probably best to disable all startup programs, but I usually don't. The onboard sound is working out pretty well too.
Of course, your mileage may vary. Hope you have better luck in the future! Like a lot of consumer products, computers are caveat emptor.
Regards,
Malta
p.s. building PC's, while somewhat satisfying, is never what I would call fun. Bios upgrades, OS installation & upgrades, installing cables & drivers, static electricity worries, and trying to mounting everything in the case are never eagerly anticipated events. Although, I will probably build my next one from parts. I just lucked into this Presario being close enough to my specs at a reasonable price.