Computer shutdown 7 seconds after power on, non stop beeps


I've built new system from the following parts :
Intel i5-4670k + OEM Heatsink
Gigabyte B85m-HD3
2x2GB HP 1333
Corsair TX750
Fractal Design Define Mini
3x 1TB HDD

After i press power, it start for 7-8 seconds then turn off, and start again after 2 seconds, everything by itself.
I've removed memory > Same
Disconnected all HDD > Same
re-pluged 24pin and 8 pin > Same
Connected speaker > non stop beeps until the shutdown

Any idea ?

4 answers Last reply
More about computer shutdown seconds power stop beeps
  1. Did you make sure that the Standoffs are in? Also, can you post more information on your RAM.
  2. Standoffs ? like the one screwed into the chassis where the board sits ?
    not sure what to check about them, but everything is in place.

    Memory (almost sure) -
    but since its not inserted now and problem still appear, i'm skeptic
  3. It won't start without RAM anyways, for mATX I think there would be 3 standoffs total, unless they are pre-installed (which they may be on the Fractal) generally they look like 1/2-1 inch brass risers.
  4. i used 6 standoffs and 6 screwes
    the memory should be ok ?
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