Compaq x09 gaming cpu

what is it worth in now it upgraded with two 160 gig hd and a refurbished motherboard it was $3500 new in 04

By cpu I think you mean 'computer'. (Edit: its weird how outside of the industry, schools insist on teaching this, they do here anyway, living in theory land rather than the real world)

The CPU is a small chip which fits inside your hand.
Find out your CPU, RAM and video card details then compare it to others on ebay. I wouldn't expect a lot.

If you download and run CPU-Z, it will tell you what those 3 parts are (which are usually the most important when selling a PC).

i went to google
and found
Intel Pentium 4 3.2GHz Processor with 800MHz Bus and Intel i875P Board
1GB Registered PC3200 DDR Memory
2x120GB (240GB) Seagate 7200.7 Serial ATA Hard Drives in RAID0 Array
HP 4x DVD+R and Samsung 48x CD-RW Combo Optical Drives
Sound Blaster Audigy 2
NVIDIA GeForceFX 5950 Ultra Video Card with 256MB Memory
Intel 1Gbps Ehternet with CSA and v.92 56Kbps Modem
Six USB 2.0 and Four FireWire Ports

is this the Compaq x09 gaming pc?