I think the answer is here:
http://h10025.www1.hp.com/ewfrf/wc/g...name=c00039102
RAM (installed) 512 MB 2700 DDR (2 x 256 MB) up to 64 MB shared video memory
Maximum allowed 1 GB (2 x 512 MB)
Type 184 pin, DDR SDRAM
DIMM slots Two
Open slots None available
To expand to 1 MB I guess I would have to buy two 512 MB DDR sticks.
Would you anticipate any problems doing this?