Hey I'm not a very computer savy person but I'll do my best to explain this.
I have an Alienware comp ( Dual Pentium 4 3.00 GHz processor, 1 gig of ram, Nvidia GeForce FX 5900XT, 120 Gig hard drive, etc...) that I wanted to put a new graphics card in but when i opened it up i noticed their is no pci express slot. The motherboard is a ASUS P4C800-E. I figured I need to replace the motherboard but have no idea of where to start, or where to look to get a new one. If anyone could just give me some advice on what to but and where to get it I'd appreciate it. Thanks!