Step 1: Check whether the computer finishes initial power-up (POST) POST means Power-On Self-Test which tests the computer goes through whenever it starts. The POST stops the start-up process when the computer fails on the any of the tests. Step 2: Unplug the all the external devices Unplug the printers, scanners, media card readers and USB storage device etc. Step 3: Check whether you are getting any error messages After the POST completion, you get error message like Loading PBR for Descriptor Here the solution to resolve Loading PBR for Descriptor Error: · Loading PBR for Descriptor Error occurs when the system not responding. Solution 1: · You need the change the setting to NO Boot in USB controller of the system. · Open the system setup BIOS screen by pressing the F2 button · Select onboard device à USB Controller à No Boot and then press Enter button · Then press Esc button · To S