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