Have u opened the CPU cover very recently !! some MB’s have a feature to detect, when the CPU chassis has been opened. Most probably, the error here is related to BIOS setup. The Intrusion Detection of bios is enabled, and so it shows this error during POST. Most modern computers have chassis intrusion switch, just connect to MB and reset it. if not, then u have to disable this option by doing bios setup in security feature called Intrusion Detection. But, If U don’t have enough knowledge of BIOS setup, then take help from an expert. And never play with bios without have knowledge !!
most of the ti me when the system halts, it is because you have change something, add ram, modify bios. but there is a message that will tell you to press f1 or other buttons to continue to run windows.