Member Avatar for redh4wk

My friend has an Advent T9306 and the problem is that when i plug the PSU into the motherboard the light turns on for the power switch but does not go off until i switch the PSU off. when i press the power switch nothing happens. no fans spinning no hdd spin or anything. ive tried taking ram sticks out and still nothing. i was wondering if anyone could give me some help on what i could try to do. im not sure of the motherboard make or model and im going to look tonight to see if i can find the make and model but the processor is an intel pentium 4 HT at ~3.4Ghz. any help will be appreciated.
Thanks

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  • Latest Post Latest Post by Xlphos

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Quick context: ’s Advent T9306 exhibits the case power LED as soon as the PSU is plugged in, but pressing the case power button produces no activity (no fans, no HDD spin). correctly asked about cables and a spare PSU; since multiple PSUs were already tried, the next steps should isolate the front-panel wiring, PSU signalling, and the motherboard itself.

Recommended diagnostic steps (do them in order; cut mains power before changing connectors):

  • Front-panel switch: unplug the case PWR_SW lead from the motherboard front-panel header. With the PSU plugged in and switched on, briefly short the two power-switch pins on the header with a small screwdriver. If the board starts, the case switch or its wiring is faulty.

  • PSU bench test: disconnect the PSU from the motherboard and drives. With AC connected and the PSU switch on, short the PS_ON signal to ground (green to any black on the main connector) to force the PSU to run. If the PSU does not start or rails are out of spec, the PSU is bad even if several were tested.

  • Minimal (breadboard) boot: remove the board from the case and place on a non-conductive surface. Connect only CPU+heatsink, one known-good RAM stick in the correct slot, the main ATX and CPU power connectors, and a system speaker. Try starting via the front-panel short. If it posts or beeps, something in the case (standoff, front-panel wiring, add-on card or drive) is shorting.

  • Visual and CMOS checks: inspect for bulging/leaking capacitors, burn marks, or bent pins. Remove the CMOS battery for 5 to 10 minutes or use the clear-CMOS jumper, then retry. Confirm the 4/8-pin CPU power connector is seated.

Interpretation and next steps: a steady LED with no spin-up commonly means 5V standby is present but PS_ON is not being asserted — either the motherboard isn’t commanding the PSU on (failed board/CPU) or a hard short prevents a start. P4-era boards often fail due to failed electrolytic capacitors near the VRM; swapping the board or testing the CPU in a known-good board is the usual way to narrow it further. If live-mains testing or shorting connectors is unfamiliar, professional diagnostics is advised.

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Member Avatar for Xlphos

Hello,

Is this the specs of your computer?

Have you checked all cables are correctly connected?
Have you any other psu to try?

Also, are you saying that when you plug the PSU in, a light on the motherboard lights up or the power button light on the case lights up (as if it were switched on).

Edited by Xlphos because: n/a
Member Avatar for redh4wk

the computer is my friends but yes them specs look similar to the one he has. and ive tried about 4 different PSUs and ive check the cables and its is the light on the power switch that is on. as if the computer was switch on. but the light does not turn off until i switch the power off from the plug.

Member Avatar for Xlphos

Hello,

Has your friend opened up there computer or made any changes to the computer?
When did this happen? whilst the computer was on, when the computer was booted up or are you not sure?

- Let us know how it goes

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