PC in a "power cycle"

  Earth2000 19:56 28 Nov 11

  Fruit Bat /\0/\ 21:38 28 Nov 11

Some information would be quite nice.

type of PC or laptop?

operating system?

message on screen?

lights flashing or noises?

  Earth2000 21:54 28 Nov 11

Its a home built PC. It does even pass POST and doesn't even get to point of putting the BIOS splash screen on the monitor so i didn't see the point in posting OS info etc.

It comes on, fans on the CPU and case speed up for 2-3 seconds then goes off then starts the cycle again.

  Earth2000 21:56 28 Nov 11

No motherboard beeps either.

  Fruit Bat /\0/\ 22:32 28 Nov 11

Motherboard - check for signs of bulging Capactiors

PSU - will power light stuff like fans / LEDS - try a substitute

or try with all DVDs drives and HDDs disconnected see if it will boot to an error message then add the drives one at a time an see if it boots.

memory - try booting with just one stick of memory try try swapping and see if it will boot.

  Earth2000 07:28 29 Nov 11

I've tried disconnecting all the hard drives and DVD drives - No difference.

Tried booting from onboard graphics and ive swapped memory over and used only one stick - No difference.

No electrical smell from motherboard or bulging capacitors anywhere on the old or new motherboard.

I think its the CPU as its the only thing i haven't swapped.

  Fruit Bat /\0/\ 19:58 29 Nov 11

Swapped PSU?

Yes could be CPU or motherboard

  Fruit Bat /\0/\ 20:00 29 Nov 11

try swapping CMOS battery and reset the BIOS to defaults

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