If you have any add-in cards, I'd not tighten the MB screws until those are nicely seated. Leave the MB to "float" ever so slightly, insert the add-ins and then snug the screws. This helps prevent some odd pressures on components that can cause things to want to pop out or develop poor electrical connections.
I am upgrading my mobo (and consequently my cpu). I know to make sure I am grounded, I made sure everything would fit and work as a "team" with the remaining components prior to purchase, I know how to put everything back together, yet I can't shake this nagging feeling that I have forgotten some step. In the past, when I upgraded, I started over from scratch, building a new PC, but this time I am just adding parts. Prior to diving in, I want to make sure I have everything ready to go. Can anyone think of something I am forgetting (e.g. do I have to do something with the hard drives to get them ready for the new mobo), or am I just freaking myself out?
Thanks - and please be kind