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hello everyone welcome to laptop repair zone in this video I'm going to show you how to fix HP probook 4 5 0 z for laptop not turning on as you can see I plugged in put charging white LED not glowing so let's try to fix it please subscribe [Music] be like so first we need to disassemble this laptop and check out the motherboard from this laptop it will take you sometimes you this is the motherboard number no physical damage or liquid damage in this motherboard so let's check step by step all the required voltage is present a lot at first time to plug in as you can see in no charging white LED is glowing set first I need to check eighteen point five volt is present or not okay agent one type oldest present this is the first MOSFET here must be eighteen point five oldest present okay no bolt is present here let's check the gate voltage this is the gate the gate also zero so in this case t