I am trying to upgade the memory on my z1-621 Aspire all in one pc. Having taken the back off the PC it is unlike any laptop or pc I have worked on. Everything appears to be stuck down and with one look at the I/O board no obvious RAM slots are available. I don't know where to look. Surely the upgrade from 4Gb to 8GB must be easier than this to accomplish without the need for a certified (expensive) engineer.