If the fan does not spin, or if it spins inconsistently, the PSU needs replacement. Locate the CLR_CMOS jumper on the motherboard, or remove the coin-cell battery for a few minutes, then reinsert it.
Pc Tower Not Turning On Light: Diagnosing PSU and Power Issues
Ensure the wall outlet is delivering power by plugging in a lamp or phone charger. You can perform a simple "paperclip test" to determine if the PSU is the culprit.
Capacitors inside the PSU can dry out over time, especially in units running in hot environments or under constant heavy load. This resets the BIOS to its default settings, eliminating configuration conflicts that might be causing the power block.
PC Tower Not Turning On Light: Diagnosing a Dead PSU
By unplugging the PSU, inserting a paperclip into the 24-pin ATX connector, and connecting the specific pins, you can see if the fan spins. Confirm that the physical power switch on the back of the power supply is flipped to the "I" (open) position.
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