I have an Asus A8N SLI Deluxe motherboard, I also have:
AMD Athlon 64 3200+
Kingston HyperX 2x 512 mb pc3200 cl 2
Seagate Barracuda 200gb s-ata
Sapphire Radeon x800XL 256 mb pci-eX

I have built the PC, but when I start it, the motherboard makes a beep code. There is no picture on the screen. The beep is one long beep that lasts for 2-3 secs and then a pause on 5 secs and then the long beep again, this is how it goes continously.

Do anyone know whats wrong? Thanks for answers

put your memory in the correct slots. A1 and B1. Counting, moving away from the CPU, slots 1 and 3, both colored blue. Make sure they are seated properly and reboot.