CMOS = Complimentary Metal Oxide Semiconductor -- it's a chip backed up by battery that holds basic system information. It is advised to reset the CMOS every time a CPU is installed.
Do this grounded, with the PC off, disconnected from the PSU:
Look in your Motherboard manual for something talking about "CMOS reset jumper". Basically it will be a set of pins on the motherboard with a thingy covering two pins. Take that jumper and move it so it covers the middle pin and the previously uncovered pin. Let it sit for ... mmm ... 30 seconds ... and then move it to the other pins.
If you can't find shit in the manual, check for these "jumpers" near the battery on the motherboard.
Here's what it should look like
[XOO] X = Uncovered Pin; O = Pin covered by Jumper
Move that jumper so it is now like:
[OOX] X = Uncovered Pin; O = Pin covered by Jumper
Sorry to sound like a retard in this post, even if you don't need to do this, it's still good practice and I wanted to break it down as much as i could.
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