Question : Problem: xp won't boot after add memory

hp a305w w/256mb ddr sdram added 256mb now computer turns on but no hdd activity and xp won't boot--remove new memory and it works fine (except needs more mem)

Answer : Problem: xp won't boot after add memory

Use HP adjustable memory. Provide the model to a known vendor (i.e. Kingston, Micron or any other) to properly use the memory. HP desktops and servers uses non standart memory banks. Also, try to check that memory module on another PC to see if you get the same results: If not than the problem may lay on you desktop. If yes, your memory module is not functioning properly.

Below is a link for Kingston compatible memory module. I would suggest you check technical specs and purchase a non expensive memory module OR just purchase that specific model and save the trouble:
http://www.ec.kingston.com/ecom/configurator/partsinfo.asp?ktcpartno=KTH5300/256

Cyber