Thanks for the reply! I've ordered some ram chips and will try swapping them out and see where that gets me. Now I just have to be patient and wait for international shipping :-/
With a few extra DRAM chips, you'd be able to install the extra 64MBs, if your MB has the extra solder pad locations, to have 128MB. Upgrade after unsoldering the originals to hopefully find a bad one, you'll already have the board out of the case.