Dude, so much AD here, why not clean them all?

Hello. Your mobo should have a manual that tells you how to set up the BIOS. If you don't have the manual, you can probably get the mfgr and model no. off the board itself, and then look it up online. Many boards can be accessed by pressing the Delete key right at startup. Others use a function key like F8. Some startup screens will also tell you what key to press to enter Setup, which is your BIOS.In the BIOS there will be different menus. One will probably be called PC Health Status, and you can enable the CPU Temp warning.