I don't have a spare PSU kicking around unfortunately. I have a voltmeter though if there's a way to test these things?
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HP Pavilion t480.uk won't power up - PSU flashes / ASUS K8N8X-LA
..so I went to the HP website and went through 'Troubleshooting Power Supply Issues (Power Supply Light On or Flashes" -
http://h10025.www1.hp.com/
and have:
1) Verified power source (different mains socket)
2) Verified 115v/240v selector
3) Pushed in front button for 5 secs whilst power off
4) Unplugged all devices from the power supply internally (so it's just a bunch of wires/plugs not going to anything). Now when I powered up - PSU was solid green.
5) Isolated the problem to the mobo (I think?) - if I unplug the mobo power plug and turn on, PSU is solid green. If I plug it back in, it flashes again.
6) I tried disconnecting the CPU fan, CPU itself and casing fan, but still same issue. Not sure what else there is to disconnect.
7) There's a tiny green LED right next to where the power plugs into the mobo. This flashes in sync with the power supply. Not sure if this means anything
I would appreciate if a hardware expert could help me out before I go and buy another mobo - and Happy New Year! :)
HP Pavilion t480.uk info page - http://h10025.www1.hp.com/
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Answers
To test with a voltmeter, you need to unplug it from all devices, and then jump the PS_ON (green wire) to a Ground (black) wire (a small paperclip work well).
The main wires to check are the red, orange, and yellow ones (red = 5v - orange = 3.3v - yellow = 12v)
down toward the bottom is a color coded pinout with the voltages:
http://www.helpwithpcs.com
here is one for 24 pin:
http://pinouts.ru/Power/at
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by: pspglbPosted on 2009-01-02 at 03:21:36ID: 23278572
Have you tried with a another PSU? If no then try it out and if yes then try changing the mobo.