My 2004 PB 1.5 has recently lost it's lower memory slot. This is the same issue which has been discussed here before. The stock DDR chip is a PC2700 200 pin. Does anyone know of a compatible larger than 1gb capacity memory chip which will work? Has anyone successfully tried putting in a DDR2 PC-5300 2GB chip this series of PB? Will it physically fit and/or be recognised by the OS? Thanks for any help.