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. When a pc tower not turning on , the PSU is the prime suspect.
Diagnosing No Power: How to Test Your PSU and Find the Real Cause
A burning smell or the distinct smell of ozone indicates an electrical fault, requiring immediate cessation of attempts to power the machine. If you hear a single click followed by silence, or if the fans twitch but fail to start, you are likely dealing with a power supply that is failing or insufficient.
Capacitors inside the PSU can dry out over time, especially in units running in hot environments or under constant heavy load. Locate the CLR_CMOS jumper on the motherboard, or remove the coin-cell battery for a few minutes, then reinsert it.
Diagnosing a Failing Power Supply Unit (PSU)
Initial Verification: It's Not the Obvious Experienced technicians always verify the basics first because the most complex failure is often a loose plug. You need to isolate whether the problem lies with the wall outlet, the power delivery system, or the internal components themselves.
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