I am building a new PC (my first one) at the moment. I have an ATX PSU and ATX case already, and my budget for new parts is rather limited. The only motherboard in my price range that does what I want is a microATX motherboard. I've read that you can use MicroATX motherboards with ATX cases, but can you do so while using an ATX PSU aswell?
A micro-atx motherboard will work fine with an ATX case and power supply. Atx cases normaly included the standoff mounts for smaller mirco-atx motherboards. In fact, I have a micro-ATX motherboard in a full size ATX case and power supply. MicroATX was intended to be backward compatible.