The specs
Asus A8N32-SLI's deluxe
CPU support Socket 939-based Athlon 64 and Sempron processors
North bridge NVIDIA nForce SPP 100
South bridge NVIDIA nForce4 SLI
Interconnect HyperTransport (8GB/sec)
Expansion slots 2 PCI Express x16
1 PCI Express x4
3 32-bit/33MHz
Memory 4 184-pin DIMM sockets
Maximum of 4GB of DDR266/333/400 SDRAM
(yes 4 gigs)
Storage I/O Floppy disk
2 channels ATA/133 with RAID 0, 1, 0+1, and 5 support
4 channels Serial ATA with RAID 0, 1, 0+1, and 5 support
2 channels Serial ATA with RAID 0, 1 support via Silicon Image 3132
Audio 8-channel AC'97 audio via nForce4 SLI and Realtek ALC850 codec
Ports 1 PS/2 keyboard
1 PS/2 mouse
1 Parallel port
4 USB 2.0 with headers for 6 more
1 RJ45 10/100/1000 via Marvell 88E8053
1 RJ45 10/100/1000 via nForce4 SLI
1 analog front out
1 analog bass/center out
1 analog surround out
1 analog rear out
1 analog line in
1 analog mic in
1 Coaxial digital S/PDIF output
1 TOS-Link digital S/PDIF output
Headers for 2 Firewire ports via Texas Instruments TSB43AB22A
Header for 1 game and 1 serial port
BIOS Phoenix AwardBIOS
Bus speeds HT: 200-400MHz in 1MHz increments
DRAM: 100, 133, 166, 183, 200, 216, 233, 250MHz
PCI-E: 100-200MHz in 1MHz increments
LDT: 1000, 800, 600, 400, 200MHz
SB-to-NB: 200-300MHz in 1MHz increments
Voltages CPU: auto, 1.0-1.5625V in 0.0025V increments
DDR: auto, 2.50-4.00V in 0.05V increments
HT: 1.2-1.3V in 0.1V increments
NB: default, 1.3V
SB: default, 1.6V
Monitoring Voltage, fan status, and temperature monitoring
Fan speed control CPU, Chassis, Power
First off How many sticks of ram do you have? is it 4x1gig or 2x2gig? try switching Ram modules around into other slots...If that doesn't work try changing the Ram timings in the Bios to "by Spd" though this shouldnt make any differnce
What i would suggest is booting to your os and running a diagnostic tools like CST Inc.'s DOS based DocMemory utility link:
http://bucarotechelp.com/computers/98011841.asp
Run this see if it one ram stick has a problem with it, if everything seems fine then update bios as old Asus bios's can be faulty: Download update 1009 from here link:
http://dlsvr01.asus.com/pub/ASUS/mb/socket939/A8N32-SLI Deluxe/A8N321009.zip
Hope this helps