If the spare unit lights up your machine, the original PSU needs replacement, which is a relatively inexpensive and straightforward fix. Additionally, check for any obvious signs of damage, such as burnt capacitors or a swollen battery.
Initial Assessment: Identifying Why Your PC Won't Switch On
Disconnect all non-essential peripherals—removing USB drives, external monitors, printers, and secondary drives—and attempt to start the machine again. Peripheral Conflict And Minimal Boot Sometimes, a PC refuses to start because of a malfunctioning external device connected via USB.
Check the back of the case for any lights; if the power supply fan is not spinning and the hard drive activity light is dead, the machine is not receiving power. Conversely, if the fans spin briefly and then stop, or if the lights blink but the screen stays blank, the issue is likely related to the boot process or display rather than a total power failure.
Initial Assessment: Identifying Why Your PC Won't Switch On
Next, inspect the power cable connecting the outlet to the back of the PC; a damaged cord is a frequent culprit. If you are using a surge protector or power strip, ensure its switch is turned on and that it is not damaged.
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