Hi just like to say I found a similar thread but now closed. I stuck that 4gb chip into the empty slot and the computer died just got a blue screen. Now realise it may have fried the version 208 Bios? Next I put the latest Bios 210 on a USB and up came the Bios page so upated to 210. Got pc back working but needed cleaner to fix registry. Now pc works with 8gb solved!!