Member Avatar for lodaleader

I installed a new computer power supply. The new computer power supply starts then it stops all of a sudden. Can anyone help?

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This situation — a newly fitted PSU that briefly spins fans and then cuts power — usually means the supply is entering a protection mode (short, over-current or a defective unit) or the motherboard/connected hardware is presenting a dead short. described the quick spin-and-stop behavior and was right to check connections; the checklist below fills in practical isolation steps that narrow the culprit without repeating what’s already been posted.

Recommended isolation sequence

  1. Breadboard the system on a non-conductive surface: motherboard, CPU (+cooler), one DIMM, and the PSU (24‑pin + CPU 4/8‑pin). No drives, cards, or front-panel leads. Power that minimal set and observe whether the PSU stays on.
  2. If it stays on, add one component at a time (video card, one drive, front-panel connectors) until the fault returns. The added item that makes it trip is the likely cause.
  3. If it still cuts out, test the PSU by itself: with mains off, jumper PS_ON to ground (paperclip test) and attach a single known-good case fan or drive to provide a small load. Use caution — this only checks basic operation; a multimeter or PSU-tester is safer and more informative.
  4. Inspect for shorts: missing/misplaced standoffs, stray screws, bent pins in the ATX connector, swapped modular cables, or the CPU power cable not plugged into the correct header. Also remove/reset front-panel power/reset leads (they can short).
  5. If possible, swap in a known-good PSU or try the new PSU in a different system. If the new PSU fails the paperclip test or trips under a minimal load, it is probably defective and should be returned/RMA’d.

A final note: repeated power cycles while troubleshooting can stress components. If none of the isolation steps finds a short, odds favor a faulty PSU or a shorted motherboard — replacement or RMA is the sensible next step. ’s request for a straight answer is fair: this pattern usually points to PSU protection, and the above steps are the practical way to prove it.

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Member Avatar for caperjack

please explain a little more as to what you mean by stops,does it ever start the computer

Member Avatar for lodaleader

I installed the power supply. When I finally turned the computer on, the fans started to turn on, but all of a sudden they stopped. The green light went off on the power supply and I pulled the plug out of the PSU. When I plugged it back in, the green light came on again, and when I tried to turn it on, the fans turned on but suddenly stopped again. I checked all of the connections and everything is in the right place. I don't know what else to do...this has been mind-bloggling for 6 hours now. Please help...

Member Avatar for caperjack

i will try first why the need for the new psu ,what problem were you having before with the old one . you could check to make sure it works ,check link ,you don't need the lights they show ,just need to see that the fan stays on .
http://www.techwarelabs.com/guides/misc_mod/psumod/

Member Avatar for Caithleann

Caperjack, I find it truly annoying that you need to known why lodaleader decided to install a new power supply in your second question, you should have asked that in your first one. You are not helping with his problem if you keep answering his questions with more questions. To refocus, his question simply was:

Why does a computer power supply shut off after two seconds?

Do you think you can answer that without playing 20 questions?

commented: Thanks for joining just to bitch and moan without contributing anything of value. -3
commented: I find it more annoying that you post crap here as if you know how to help the OP -2
Member Avatar for caperjack

Caperjack, I find it truly annoying that you need to known why lodaleader decided to install a new power supply in your second question, you should have asked that in your first one. You are not helping with his problem if you keep answering his questions with more questions. To refocus, his question simply was:

Why does a computer power supply shut off after two seconds?

Do you think you can answer that without playing 20 questions?

what ever , i find it annoying that you post a comment to a year old thread ,oh and i love 20 questions

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