Are my computer components compatible with my case?

Without knowing your computer component and case (or chassis case) we cannot answer. Chassis cases come in all shapes and sizes, but will conform to a form factor. For instance, an ATX chassis case will accept an ATX motherboard and an ATX power supply, along with a number of 3.5" hard-drives and removable media drives (CD/DVD/Blu-Ray). Generally, the larger the chassis case the more form factors it will support. Therefore a microATX form factor chassis case will only support a micro ATX form factor motherboard at most, and fewer hard-drives. Other form factors include FlexATX and mini-ATX. In general, you want a chassis case that is larger or equal to the combined motherboard/power supply form factor, and that will support all the internal drives you intend to install. Before purchasing a chassis case, it pays to look inside and check the layout as some are better designed than others. A common problem to look out for is a hard-drive mounting position that causes the rear-end of the hard-drive to interfere with RAM chips or peripheral cards, or that limits access to the drive interfaces on the motherboard.