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Oh and don't forget, don't force anything into a slot. I know how it sounds almost silly to say this but I have seen a lot of people that tried to force a RAM stick in place with too much force and broke both the mobo and the stick of RAM because they had it upside down.

All slots on a PC are keyed to prevent you from pitting anything in incorrectly so just pay attention to that. This goes for the power connectors too.

And I promise you, you are quite lucky that everything is keyed now. On my first build, pack in the day of Pentium (not even Pentium II) you could easily connect power cables to the wrong place. Most IDE cables could be installed upside down without knowing it, and the motherboards had jumpers for just about every setting that you now see inside the BIOS. Not to mention ISA and PCI slots that used the same port for different verisons/speed ratings and were not backward/forwrad compatible.