Check the warranty and hope. But yes, the motherboard can be the cause. Tip: Try some USB keyboard and make good posts that are are not in all capital letters.
QUESTION DELL GAVE ME A NEW MOTHERBOARD (ON/OFF BUTTON STOPPED WORKING AFTER FOUR MONTHS). NOW MOUSE, SPACEBAR, AND N + B+? KEYS STOPPED WORKING.IS MOTHERBOARD INVOLVED WITH ABOVE MENTIONED? THA-KS AND -YE -YE WENDY