Member Avatar for thytao

My dell 3000 won't power up after a thunderstorm. The computer
was on during the thunderstorm and suddenly died. Could you tell
me how to check if the problem is due to the power supply or the
motherboard? Thank you very much!

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A short expert summary tied to the thread: a thunderstorm surge can kill the power supply, the motherboard, or both. reports a small green LED on the board but no front-panel activity; that normally means the standby rail (5VSB) is present, not that the PSU or motherboard is fully healthy. is right that replacing the PSU is often necessary, but a few safer checks will narrow the fault before buying parts.

  • Safety first: unplug the PC and work on a nonconductive surface; do not open the PSU (high-voltage capacitors).
  • Quick external checks: try a different wall outlet and a different power cord or strip.
  • Visual inspection: look for burnt smell, blackened areas, blown or bulging capacitors around the ATX connector and VRM. These are common signs of surge damage.
  • Minimal-boot test: with power off, remove nonessential cards and drives, leave CPU and one RAM stick, then try to power on. If nothing changes, that points past simple shorts.
  • PSU verification: use a purpose-built PSU tester or swap in a known-good PSU. If you can measure voltages with a multimeter (only if comfortable), main rails should be roughly +12V, +5V and +3.3V and the standby ~+5V; absence of main rails with standby present implicates either the PSU or the motherboard power-on circuitry.

If the PSU checks out but the system still will not POST, the motherboard power circuitry was likely damaged. If data is a priority, remove the drive and attach it to another machine or an external USB-SATA adapter. If the machine is under warranty, contact Dell; otherwise a PSU swap is the lowest-cost next step before replacing the motherboard.

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Member Avatar for techniner

Are you getting any lights on the front of the machine when powering up?

Have you tried disconnecting power for the motherboard for 5 minutes then try and power up again?

Member Avatar for thytao

No light on the front. On the motherboard, there is a small green LED. When I plug the power cord, the LED is light. Does that mean the power supply is OK? How can I check the power supply? I heard that
I need to short two pins of the 20-pins connector. Could you tell me
more details for checking the power supply? Thanks

Member Avatar for techniner

Sounds like she is toast to me.

If the machine is still under warranty dell can overnight you a new one.

I would not mess with that PS.

Get your self a new one.

From dell MAX it can be if needed ot purchase is 30.00

Can probably get it cheaper online.

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