Product: HP Pavilion 733b Desktop PChttp://h10025.www1.hp.com/ewfrf/wc/product?product=296502&lc=en&cc=us&dlc=en&lang=en&cc=us
Motherboard: FIC VG31
[ First International Computers ]
Memory Type: DDR Sdram
Memory Speed: DDR Sdram at 266MegaHertz, or 200MHz
(PC2100, and PC1600, respectively)
Memory Sockets: Two. For Dual Inline Memory Module/s.
Maximum Memory: -> Maximum TOTAL Amount for motherboard.
Maximum Amount for EACH ram memory slot: 1GB
So far looks good, BUT;
1) Is the Ram Memory Non-ECC?http://en.wikipedia.org/wiki/ECC_memory
2) Un-Buffered? (Un-Registered)http://en.wikipedia.org/wiki/Unbuffered_memory
3) Voltage: Does it use 2.5 Volts?
JEDEC standard for DDR Sdram ram memory voltage is 2.5 Volts (DC)
FIC is going to set the ram memory default voltage at 2.5 Volts.
Point? DDR Sdram at 2.6 Volts, or higher, may not work.
Betting the motherboard doesn't have SPD, and the ram memory may not either.http://en.wikipedia.org/wiki/Serial_presence_detect
4) Ram Memory frequency rate:
What frequency rate of ram memory are you using?
The Intel 82845G Northbridge chip, will only support DDR Sdram at a -> Maximum <- frequency rate, of 266Megahertz. (266MHz),http://en.wikipedia.org/wiki/List_of_Intel_chipsets#Pentium_4_chipsets
I have seen websites offering DDR Sdram at 400MHz for this board.
Maybe there is a BIOS update, I don't know. But going with the standard BIOS program that is installed, and info for the Intel 845G support, I would say this = No.
Processor Front Side Bus (FSB) support is either 400MHz, or 533MHz.
Ram memory typically operates at HALF of the Processor's FSB.
That would be 200MHz (PC1600), or 266MHz (PC2100), respectively.
[Half of 533 = 266.5
It's just rounded down to 266 ]
Can you read a manufacturer's label on the ram memory modules?
If so post what you see in a Comment.
[Sometimes when upgrading ram memory, it may take you to turn the computer completely off, and wait 1 minute. Then turn it on, and let it run for a couple of minutes, then turn it off. Wait 1 minute, turn it back on.
IF, the motherboard does have SPD, and IF, the Ram Memory has SPD, it may take a couple of 'Cold Boots', for BIOS to recognize the Ram Memory.
Some of the old mobo's were just like that.