Computer NOT working as it should


Every time I startup my PC, the Gpu, CPU and the keyboard and mouse don't work only the fans in the case and my external hard drive work. Tge moniter also doesn't get a signal. Everything is plugged in and was working yesterday. If u have any tips or a solution please let me know it would be very much appreciated. Peace.

System Configuration: Android / Chrome 89.0.4389.105