You decided to upgrade your PC with a faster processor. To do this, you ordered a new motherboard over the Internet that supports the processor you want to use. When it arrives, you discover that the motherboard uses the Micro-ATX form factor. Your current case is an ATX mid-tower with a standard ATX motherboard inside. What steps must be taken for the Micro-ATX motherboard to work in the ATX case

what is to be done in this case is to use the Micro-ATX motherboard in the ATX case.

Explanation:

ATX and Micro ATX are different because ATX is a rectangle board with dimensions of 305mm by 244mm, whilst Micro ATX is a square board with dimensions of 61mm by 244mm.

From the above, it can be observed that the ATX case is bigger than the Micro ATX motherboard.

Therefore, what is to be done in this case is to use the Micro-ATX motherboard in the ATX case.