This is fitted with 2 x 512Mb DDR2 PC2-4200. I bought 2 x 1Gb sticks from Crucial. Put them both in and booted - two beeps indicating RAM problem. Took one stick out - booted OK. Swapped the sticks over - booted OK.
So, why will it recognise a single stick but not the 2 (Spect say up to 4Gb is OK)?
I can't do anything as the beeps start before anything appears on the screen. I've asked for a new set of RAM to be sent, so will report back when that has arrived ( not overly confident as single sticks seem to work OK).
Try one new ram stick with one of the older ones. See what the bios recognises. As a matter of fact you should be able to get to the bios as the machine boots. Find what key is needed to get to bios and tap like hell as fast as you can.
Realistically I think your mobo can't support 2gig of modern ram without flashing the BIOS and that is another kettle of fish.