This often points to a failure in the SMPS section. The schematic helps you verify the 12V and 19V outputs. If these are missing, you’ll need to check the EMI filter, rectifier, and the main power IC (often labeled near EB1 or UB101).
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He grabbed his multimeter and began the dance. Voltages at the 12V rail: dead. Standby 5V: present, but unstable—flickering between 4.8V and 5.2V. He checked the bridge rectifier: fine. The main filter cap: holding charge. Then he probed the primary side of the flyback transformer. Nothing. This often points to a failure in the SMPS section