Power issues

Computer shutting down.

Gigabyte GA-8I945PL-G mobo
500w easy cool power supply.

All hardware and cabling has been removed except CPU / Heatsink / Fan and cables to use on/off button and LEDs.

At POST computer gives continuous short rapid beeps indicating power issue.

Tried with 350w, 450w and 500w (usual one) power supplies - all give same result.

Removed, checked and replaced mobo - no apparent shorting going on.

Removed and reseated CPu heatsink and fan - no visible issues and is correctly seated.

reconnected main (24pin) power cable to board and 4 pin ATX power cable.

What else can I check for?
Does anyone have any ideas that may help.
What are the possibilties that I haven't covered yet?

Thanks

webecho

Newbie Poster

20 posts since Aug 2006

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check your memory card..or try using a new one

Nearly a Posting Virtuoso

1,317 posts since Apr 2007

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Was this computer ever running or is this the first time you have fired it up?

When you reseated the PCU did you reapply thermal compound?

Posting Virtuoso

1,534 posts since Mar 2005

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This article has been dead for over three months