When your moth­er­board does not rec­og­nize your key­board or mouse, it may have three cases:

One, key­board, mouse, 9 pin ser­ial port, 25 pin ser­ial port and game port are gen­er­ally com­manded by periph­er­als’ con­troller chips such as IT8702F-​​A (ITE) or 83977EF– AW (Win­bond). And those parts on some moth­er­boards are directly con­trolled by the North­bridge chips. If these moth­er­boards do not rec­og­nize their key­board and mouse, first of all, you should exam­ine whether the 5V power sup­ply­ing key­board and mouse is work­ing nor­mally. If it does not work prop­erly, you need to check whether the safety resis­tor of the power sup­ply is fused. In case the fuse resis­tor is in high resis­tance, you can directly con­nect a thin wire to the line. (For cost sav­ing, some moth­er­board mak­ers also use a thin wire to directly com­mu­ni­cate the line with­out a fuse resis­tor). If the sup­ply of power is work­ing nor­mally, rul­ing out periph­eral prob­lems the trou­ble is com­monly due to the two afore­men­tioned chips that are dam­aged after hot plug­ging the key­board or the mouse, and for this you need to change a new con­troller chip.

Sec­ond is the loose of the key­board port or the mouse port. Some­times your key­board or mouse can work again by gen­tly shak­ing them. It is because fre­quently plug­ging your key­board or mouse would eas­ily make their ports loose and leads to poor con­tact between the ports and the key­board or the mouse, and then you need to replace the ports.

Third, key­board or mouse is not com­pat­i­ble with your moth­er­board, which man­i­fests as key­board or mouse can not be found on boot, prompts to press F1 to con­tinue on start, or mouse moves ran­domly on the desk­top. If so, you need to replace the key­board or mouse.

Why not click here to see what dri­ver prob­lems or out­dated dri­vers your com­puter has, and how to fix them quickly and auto­mat­i­cally with Dri­ver Checker?

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