A desktop that won't turn on is usually a power or connection fault — not a dead machine. Work through these checks in order before assuming the worst.
No Lights, No Fans- Try another power cable and a known-good wall socket; check the PSU switch (I/O) on the back.
- Confirm the voltage selector (if present) is set correctly.
- Reseat the 24-pin and CPU power connectors on the motherboard.
- A dead power supply (SMPS) is the most common cause — and an affordable fix.
- Reseat the RAM (one stick at a time) — loose/faulty RAM is the #1 no-display cause.
- Reseat the graphics card; plug the monitor into the CARD, not the motherboard.
- Listen for beep codes — they identify the failing component.
- Often overheating (clogged CPU cooler) or a failing PSU.
- Clear CMOS if it started after a BIOS change or overclock.
If reseating power, RAM and the GPU doesn't help, a technician can bench-test each part (PSU, board, CPU, RAM) to isolate the fault quickly — usually a cheap PSU or RAM fix rather than a new PC.
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